Pure hell getting refund after argos lose items

Noverber 12 last year I placed an order for 3 hard drives and a hard drive cooler from two sellers. Before the order arrived I placed an addional order for 3 more hard drives. I'd always intended to order 6 drives but split the order to spread the billing. I used click & collect as it's easy and local.
I received 2 email's to collect the first order(s). When I went to collect I was told they could not find both items for the first order. I also recevied an email to collect the secodn order of hard drives which was present and correct. I was now missing 3 hard drives and a hard drive coller. I continued to receive collection reminders and was always told the same thing.... they could not find them. I was told to contact Paypa, which I did and was advised to contact ebay as the click & collect service was run by them. This made sense so I did contact them. I was initially told that they would check things out but I would get a refund. I was advised to give them 72hrs to get back to me. I continued to get collection reminders with the same result of cannot find items. I was then advised that because I had spoken to Paypal I could not have two claims in process. I was advised to close the Paypal claim and they could proceed to process my refund. Up to this point I was quite confident that it would all get sorted out. I contunued trying to deal with ebay but was beginning to find their 'systems' were very difficult to use and each and every time I tried to make contact I was having to go over the whole process each time. I was however assured there was no problem. I placed an order for another 3 hard drives to cover the 3 that had gone missing as I was not able to finish the job I had started without them. After all I was assured it was being dealt with and not to worry. I was now insisting I dealt with a supervisor or manager and was passed omto a very pleasant lady who at last had a grasp of what was going on. She contacted the argos branch and was told that a mistake had been made in entering the item onto their system that 'she' had corrected and the order was now ready for collection. I was given a collection number FOR THE LAST ORDER which was for 3 hard drives and a graphics card. The collection number was a NEW number for the NEW order which is exactly as expected. So far the second and third orders had been completed with the first order outstanding. The last order had been completed with no problems. However still missing the original 3 hard drives and cooler cage. I had unique collection numbers for the items and getting very concerned. Paypal advised that as I had not escalated my original claim it would expire automatically 24th December. It was closed and advised. It then transpired that I had been given a credit for the hard drive cooler but NOT for the 3 hard drives. It also became clear that argos had altered the missing items from waiting for collection to COLLECTED!
I frantically got in touch with ebay and explained that I had raised my concerns about Paypal closing the claim to allow ebay to deal with it. Ebay now told me YOU ARE OUT OF THE 30 DAY LIMIT to make a claim and they could not raise a new claim as it was out of time. I explained that as far as I was concerned I did have an ongoing claim and had be assured all along it was being dealt with. I was told the matter would go to their click & collect department to investigate and I should allow 72 hrs for them to contact me. They did get in touch only to delay things a further 72hrs. The claim is not referred to as Item has been collected in any emails I receive which is just not true. I have not heard back from ebay since 26th January. I have tried to get them to call me back but they never do. I have trusted them all along and am now about £170 out of pocket. I cannot get through directly to the same person that I have been dealing with and the whole things has become a nightmare. It's now affecting my health, which is already not good, with no end in sight.
To sum up the items were deliverd to argis by the carrier who have a signature fro delivery. Argos did receive the items ore they would not have been sending out emails to collect. Ebay is I fear guving me the cold shoulder by ignoring my requests for them to contact me.

You have to remember that I have very little paperwork for the whole mess as you only get the information they provide directly. You cannot get contact details etc to deal directly as the 'system' is very effective at keeping you away from actual humans.

Having trusted them all along I feel I am going to lose approx £170 through no fault of my own excepting my stupidity in trusting them to deal with it efficiently.

What can I do? Can somebody help PLEASE!