Mitsubishi Electric India — Regarding air conditioner

I bought ac from Rajkot's delar, just after 2 month we get problem in our ac, and i contact to customer support, they raise claim regarding that, and they sent technician from service center, after that they raise another claim for some plastic part, and they also sent that part, but its not fitted in my new model, so they request another part which is fit on my model, but I didn't get that part yet. its almost gone 5 months, but didn't get proper response from service provider and company.