Problematic motor vehice

I'm currently experiencing huge and endless problems with this vehicle i have purchased from the dealership called SMT Motors at the address 7 Bram Fisher Drive , Linden Extention Randburg Johannesburg (contact details ***) for Vw Caravelle 2.5TDI 2005 MODEL. I purchased the vehicle cash from them, from a sales person by the name of Craig Ravenscroft for an amount of R171 395 and took delivering on the 30th of June 2015.<br> <br> I understand this is a used vehicle and wont be as great as a new vehicle however The problem began on the very next evening after taking delivery, the vehicle started lossing power when accelerating and I took it back to the dealership to get it checked and fixed and from that specific day of the 1st of July 2015 it's been a problem since then, till this day of the 27th of October 2015 as I write complaint it's back at the workshop being fixed it's been 3 weeks it has been taken in, which really never seems to be fixed perfectly. The vehicle has been to the dealership and workshop about 7 times, back and forth and i receive it back from them and there is another problems, every time it comes back with gearbox, the engine, oil cooler and the list is end