Intex Technologies - Phone not delivered

I just gave my phone to the cell tech service centre two months ago for resolving the charging problem. Initially, they said it will take **-** days to fix this because they didn't have the part. And after ** days they were giving excuses and asking more time like they were saying it will be ready in two days and after two days they were again two days and it went like one month. Now they are saying like you won't get your mobile because it was not in good condition so they were replacing my mobile with another device. I am saying that I want only my mobile even though it's not working they were asking more time. So that's is the reason I won't file a complaint about this service centre.