Car Jerking after 3 months

Hi,<br> I traded in my BMW 330I Covertable at Zambesi Auto in November 2014. I did a straight swap with an Audi TT TFSI that they had in stock. The Audi was taken in for service in November and was then delivered to me. <br> After 3 months of driving it, today on the 3/02/2015 the car is jerking up.<br> <br> If everything was checked when they did the service I don't think I would be experiencing such problems so soon.<br> <br> I feel that Zambesi Auto has ripped me off, and now I have to pay for the costs to fix the car.<br> <br> I most definitely do not recommend anyone to buy cars from them<br> <br> Lindi