Flipkart — I am complaining about voltas ac

I ordered 2 ac(whirlpool and Voltas ) by flipkart. but i got problem in voltas ac which was not cooling. i complained for voltas ac to flipkart. a guy came and checked and uninstalled for the replacement. after that no one came at my place.
I complained 4 time for the replacement. and today i got a email that the return request for this order has been cancelled as the pickup was unsuccessful. every time happening the same thing. hamesha expected pick time milta hai. or fir cancel ho jata. fir complaint raise krni padti. pata nahi yah kab tak chalta rahega. I am very fed-up with flipkart services.