VW Brits selling Cars that are not in good condition

I bought a car in December and realized it had a lot of defects, first week of January i contacted the sales person Dedrick Mokoena that i am not happy with the car and he must arrange to collect it which he did.

I then said to me the defects that were on the car are an indication that there was no quality check on the vehicle prior to them selling it to me and as a result i would like to cancel the contract, he delayed the issue with an intention of the 30 days period given until today that he says he is not the one responsible for cancelling the contract but the bank

His service is very terrible as even today the car is not yet back with us but they are busy deducting the installments. I do not want that car and as indicated i wanted to cancel the contract but he delayed on purpose. Today i got an email from his boss Christof Seeger who displayed non interest on the issue.

I need VW head office to intervene on this issue as a matter of urgency.