I never knew buying my car at Renault was a mistake

I have take my car for service in March at Renault Melrose , I told them my right window is not working, they fixed it and told me they ordered the motto because the one in my car is faulty, until today I am still waiting, I try to call them I can't remember who I spoke to but the guy took my number promised to come back to me even today I am still waiting, I called again and the guy told me that I am not the only one who is having the same problem as that is my fault. And took my number and promised to get back to me and until today I am still waiting. I have to open a door everywhere I am stopped and no one is willing to help. I bought my brand new Triber from them last year and I regret choosing Renault because my car is still under warranty and I am being told that I am not the only one. If I am not the only one does that make it my fault, does it means that I must wait for months without help, I am paying for this car!!!