Yes it's The Car

so after 1 week with the dealership the vehicle was returned to me, they had clocked up 240 miles on the speedometer?, they did not produce any receipts to prove the worked had been carried out, I questioned this on the day 31/4/17 and they said I would have a copy of the invoices tomorrow ( 1st April 2017, "very apt") I contacted them again on the 3rd/4/17 for the invoices and again was brushed of with some feeble excuse, during this time I had noticed there was lots of oil leakage over the exhaust at the rear of the car, I told the dealer about this on the same day of the telephone call, he again assured me that all the work had been done and they had fitted a new haldex, rear diff etc, I have a recording of this conversation, until this time I had not driven the car, however to be sure it was safe I booked it into a 4 x 4 specialist on the 4/4/17 the inspection revealed that the oil leakage was due to haldex vent pipe disconnected and blocked, this had to be unblocked, cut and repair and reconnect, the cost was £50
today 6/4/17 I phoned the dealer again and requested the invoices to prove the work had been done, again I was fobbed off with hospital this and excuses about that, I was then told "the worst thing that we ever done was sell you a car etc etc etc", I explained to him that the vehicle was returned with a broken haldex vent pipe etc which I have an invoice for the work carried out, their response was "you bought a second hand car mate what do you expect" during this time, because I had made 2 different CC deposits when I purchased the car, I contacted the the other CC company and they have sent me a letter requesting information regarding my claim under section 75, however both CC companies are under Bank Of America.
should I go for the section 75 (another 7 months of stress) or should I take the dealer to court?
any advise is truly appreciated
Thank you

Thank you, the first section 75 case against MBNA was closed by the FO, they said I should return the vehicle for repair, this would be a new case under section 75,

thank you, do I go back to the case worker or contact the FO direct?

this is the response from the case worker

The complaint I investigated and which has now been closed was against MBNA.
!
If you’re not happy with the work that has been carried out by the dealership, this is something you will need to discuss with the dealership. Because, as I’ve explained previously, we don’t have the jurisdiction (authority) to look at complaints about car dealerships – because they aren’t carrying out a financially regulated activity.

The case worker gave me the email address of her manager should I wish to complain.
Here is the rest of her reply, please advise what my answer should be, take into account the case worker is adamant there was no previous breach of contract

We can re-open your complaint, should you wish, and I did let you know this previously. The complaint was closed on our systems as at the time, we weren’t doing anything in your complaint. We can’t keep cases open indefinitely, so if you’d like the complaint re-open, this is something I can arrange for you. But we’d like to know the reasons why. I have already endorsed my answer (first answer was sent on 23 February 2017 and my endorsement was sent on 15 March 2017, which we also discussed over the phone).