Firstplus PPI - should I reclaim after receiving cashback?

gian63

Hello, I hope someone can advise me as I have read previous threads and I am a bit confused.
We took out a Firstplus loan for £20000 in 2008 and was told on the phone that the PPI with it was basically like a savings plan as we would get our money back if we did not claim and did not go into arrears in 5 years. I thought that was a brilliant idea as I had other PPI's and insurances that did not offer this.
Both my partner and I have critical illness/death policies and I have a 'select and protect' insurance for us both as well, which is for short term illnesses and pays even if our jobs pay sick.
. Because this was a secured loan, I was convinced that we would lose the house if we couldn't pay, I was not asked if we had other protection and like I said, were sold it as a 'savings plan', so it seemed like a good idea.
During the conversation I was told that if I extended the load over 7 years, the monthly payments would be cheaper, which I agreed to do.
Anyway, 5 years passed and we have been paid £4898 back (payments over 5 years for the PPI was £4812 so we were paid slightly more than we paid in.
But now, I see from my bank statement that the monthly payments have not decreased by the PPI amount, which I was expecting.
Looking through this thread I see I was conned and that the PPI payments continue after we are no longer covered.
Also, I am the first named person in this insurance and I've read through the bumpf since discovering the continued deductions of PPI, and it says that the second named person is only covered for life insurance and not anything else. My husband does not get sick pay and so it was more inportant for him to have the illness cover and not me.
I get fully paid for 6 months from my employers and on top of that we both have critical illness and life insurance and another PPI. So this PPI was actually worthless for him anyway.
All this was not advised at the time and no questions were asked of me.

Now that we have had the cashback, can we make a claim on the mis-selling? I think we were mis-sold on several things,
1) I was sold this as a 'savings plan' as an encouragement to take it
2) I was not told that the payments would continue for the life of the loan even though the cover would not. I was actively encouraged to extend the loan to 7 years from 5.
3) I was not told that the second named person would get only life cover - nor asked which one of us would need the most cover (evidentally or I would have said my husband and not me as the first named.)
4) We have other insurances and life cover.
5) The loan is £327 per month and the PPI is £80.20, I've checked and this is a very high amount to cover the loan repayment, I think I could have gotten cheaper insurance if I had been told I could look around.

Can I get Firstplus to stop taking the PPI each month?
I am not sure if we are owed any more money, (probably interest) but just reducing the payments would help.
Or could/should I claim for more than this?
It seems some people have ended up owing more money by trying to sort this out and I don't want to be in a worse position if I make a claim. I'm very worried, but on the other hand I don't want to pay another nearly £2000 for a worthless PPI..
Please can someone advise?