Vauxhall Corsa touch screen problems and search lights

We Brought out new shape corsa in may 2015 brand new ,

it has been in the garage about 4 times in 9 months for repairs .

rivets on handbrake went and has been replaced but still a issue garage are deninig

touch screen freezed about 3 months ago and had to be reprogrammed and freezed again in November and went back in and said needed a full new radio system , they have replced this and had issues programming the radio and had to speak to Vauxhall , was advised all sorted and collected the car for this to fault again and freeze up again on the way home and now my head lights have stopped working when I unlock the doors but system say they are switched on to light up when unlocked . reversing sensors are working when they want too.

it had sealent under the boot lid and had to have a respray also black sticker strip on door coming off and had to be replaced and seal around door had to be replaced as ripped .

we paid for the car £13,000 and finaced on pcp for 3 years , we spoke to used car lot at Vauxhall and valed the car at £7500 to part exchange for another car as we are fed up with the car and lost faith in it , they told us that they have sent the video off to Vauxhall that we filmed after they said we wouldn't have any issues again with the radio as new and said they have to wait for Vauxhall to get back to them. I told them we have lost faith and want to swap the car and they said they cant do that and have to wait for Vauxhall. we now are £3,200 in negative equity and we are trying to finance another car a Mini that they have in used to get rid of the car and they are passing the book to Vauxhall . We don't see why we should have to carry over the £3,200 to another car that is faulty and not fit for purpose. What Can we do , I have been informed that they can should swap our car for the one we want and transfer the finance over as the car we want is the same as the settlement for the corsa .

Help needed