Avoid!!!!

You see an advert on tv for fully safe & numerous checks on a used car… come and buy….. DONT. I purchased a car from motorpoint end of November, January problems started… the steering would veer to the other side of the road. Had my tracking done at a tyre specialist who said it wasn’t the tracking it is an issue with the car and to contact where I got it from. So I did, only to be told by a snotty woman that it’s out of the 30days from purchase and as the car goes through 100 checks before it gets to me she ‘highly doubts’ there was a problem. Right ok. I contacted warranty which I paid extra for. Who booked it into an impartial garage that they recommended. After 2 weeks it’s still in that same garage. He can’t fix it, a network of over 500 mechanics can’t fix it. Everything that has been suggested has been tried and hasn’t worked. Not only this on inspection of the car the ABS system was faulty and it had 2 leaks from underneath the car. He claimed it obviously had not been safety checked and I should return the car. He is helping me and I am trying to get motorpoint to have the car back which under the law they should. According to the law as it is less than 6 months since purchase the dealer is liable for the car unless they can prove otherwise. I have spoke to them and they have no proof the car was checked before sale. The woman I am dealing with is useless. She hasn’t helped me at all and just keeps fobbing me off. According to the law it’s the seller who should repair it, they have paid the mechanic £700 for the investigation so far and have agreed that they can’t do anymore for the car. So now I am trying to get them to have it back, while also paying a finance company for the car, paying insurance, and also taxis to get my children to school and me to work. It’s ridiculous. DONT EXPECT ANY HELP IF IT GOES WRONG. They want me to resell them the car but will only buy it back knowing the condition it’s in that it’s completely broke.
They sold me a dodgy car, a faulty car, and they mis sold me a safe car for my kids which obviously is not a safe car. The mechanic said it was dangerous to drive and he wouldn’t let me drive up the road let alone to oldbury to give it back! I have a new born baby who I have been driving round in this car! I need this resolving!!!