Dissatisfied client

I bought a car at autopedeegree plumstead in June, after just 1 week the car got stuck. I took it back to the dealer and they told me to take it to Ford in Diepriver, after the car was assessed and quoted, the auto pedegree guys took the car to their own mechanic. They told me after a day that the car was fixed and I collected it. After 1 month the car got stuck again with the same problem. I took the car to ford again and after diagnostic, auto pedegree took the to their mechanic again. After a day they called to collect the car, when I got there I requested to see the job card of what was fixed/replaced on the car, the invoice plus the guarantee that the car won't give me problems again. But the manager refused, and I asked him if I can return the for my refund and he refused still. Now the car is sitting with him while I'm still paying for it.