Purchased a 2 year old used car gave me problems f...

Purchased a 2 year old used car gave me problems from day one. As a reference the seller Luigi T. Who to sell very kind then less. They wanted me to fix the car with the used guarantee but then I took it to them .... They repaired it ... But after 3 days on foot. Held to repair a month (given a courtesy car that yes) but after 5 days to walk again. I requested my right to withdraw from the contract by registered mail with no reply. What a figure of unreliable and unprofessional people to be a Ford center !!!!