Sorry I bought the car on the 16th of December 2021. It went to the garage on the 25th of Jan 2022

Hi I'd like some advice on a vehicle I bought from a sole trader The car was advertised on autotrader with no faults. I spoke via text and agreed a price £200 cheaper however again no faults disclosed and advertised with a years mot I then arrive and the car has the DPF light on, mot due in two months and I could get a slight smell of burning oil. The trader kept referring to the warranty stating that he's added the DPF option to it and it will cover the faults. A further £200 reduction was agreed due to this and the inconvenience. I took it to a garage who diagnosed all four glow plugs inoperative and more importantly the turbo seals had gone and therefore requiring a replacement. I went to the warranty company as advised when contacting the trader and they've refused it as wear and tear. I've contacted the dealer again and he's arguing I knew about the faults and bought it anyway and the reduction in price was compensation. He argues that he stated the warranty company would cover it yet I have this on messages. Lastly he's offered £200 goodwill towards a bill which is likely to be £2000 Any advice on how I stand within the consumer rights? I would have no idea the turbos seals were gone and the faults were clearly present at the time of sale. The glow plugs were the reason for the DPF light however he claimed the warranty would cover it assuring me however they have not Any advice?