Car Dealer Charged Me For Returning Faulty Car

[numan]

've tried several time to ask this in the law category, but it just won't go!

Please could someone give me advice? I bought a nearly new, second-hand Citroen car from a well-known dealer, but it was faulty and I returned it after only one week. After a few heated words, he gave in and refunded me most of my deposit of £5,500 but kept £200 back for the 'inconvenience' to him and because he'd kept my old car (for parts), stating that he had the cost of dismantling it. He then went on to sell this faulty Citroen (according to the showroom website) at £150 over the price I originally bought it for! This means that he's made £350 more than he would have if I'd kept it!
Do I have any rights as to demand the £200 back that he kept from me? I have just received the log book (V5), which I have to submit to him of course, but I'd like to know if I can withold it legally until he returns the £200 he kept from me.
I'd like some legal advice please, as I don't want to be breaking any laws over the V5, or demand my money back if he has any right to keep it e.g. for the old car I left there.
Thanks in advance

[numan]

@bednobs Yes, I know. I only received the V5 today and reported straight away to the DVLA online that I have sold it back to the trader and that I don't own it any more. PHEW!

[numan]

@bednobs I had the rest on finance, that I was going to pay in full once I knew I was happy with the car. Glad I didn't do it straight away!

[numan]

Thanks to you all. I've decided to take advice on threatening bad reviews (which I WILL make, once I have my money back) and withholding the logbook (I'll have it on me though...) until they refund my money in full. You've all been really helpful and put my mind at rest. Cheers! x

[RandyMarsh]

also let the finance company or broker know, they both have a duty of care to you if the have vetted and paid out to a dealership x

[numan]

@ToraToraTora No, I wouldn't take them to court over that amount, you're right. But it's nice to know that I'm well within my rights to and that they don't know whether I actually will :)

[numan]

@RandyMarsh Will do. Thanks

[ToraToraTora]

apologies, I'm confused, in your post at the top you say "he gave in and refunded me most of my deposit of £5,500 but kept £200 back" - so you got £5300 back, right?
at 16:37 you said;"Thanks to you all. I've decided to take advice on threatening bad reviews (which I WILL make, once I have my money back)" - so are you still actually waiting for the refund?