Xiaomi India — Irresponsible service centre in goa

This is with regards to the service provided by xiaomi . I had given my phone which had some power issues about 1.5 months back to the only service centre in goa. First of all it doesn't look like an authorised service centre . The lady told me it would take 2 days to repair my phone . When I called them up they say they need to change the board and it would take another 10 days. 10 days later I called them they say he board is ordered and will take another 2 weeks. 2 weeks later and still the board hasn't arrived. Which makes me think that this is some of kind of joke . I have never seen such a clumsy, irresponsible mobile service centre . That too xiaomi being one of the fast growing mobile brands in the country . I don't have my phone as yet and as a result I haven't been able to access so many files which were on that phone which has resulted in me losing a lot of money indirectly . I am very disappointed at the way the customer is treated. I need to know how can I get compensated for the same .