Need advice on car sale

Brought a Jaguar S type,V6 2.7 D, SE for £2100 from Woodside Vehicals Ltd,
1-7, Peters Street, Bury, Gt. Manchester, BL9 6AB. The advert, on line, told me
they would deliver to my door, they had a 7 days return policy and offered a 4
month warranty. After asking Ali, the salesman, as many questions as I could
over the phone I felt confident enough to go ahead with the purchase.
Car arrived Friday 03/05/2024 at 5pm (approx). On Monday 06th I drove the
car for the first time, it broke down and I had to call the AA. Quick, cost free fix,
something to do with the fuel pump. Wednesday, the next time I drove the car
an engine warning light came on the dashboard. I drove it directly to my usual
garage that services my cars and asked them to check it over for me. Couldn’t
do the job until Friday and at lunchtime they phoned with the bad news. 10
pages of faults and 2 photos of underbody rust. I was told by the seller that the
car was rust free. Having this news I immediately contacted the seller telling
him that I wanted them to collect the car and I wanted a full refund. I was told
somebody would contact me later. They never did. I contacted them on the
Saturday to be told by Ali that he was in a meeting and would contact later. He
never has and now my calls go unanswered and my texts are ignored. I think
my phone may have been blocked.