Yaantra — tab not repaired every time they said new problem is occuring

I gave my samsung tab a for repairing to yaantra, the issue with charging strip, they said they replaced some hardware and charged 1600 rs in total. The problem resurfaced again. I gave the tab again to them they said its moisture issue hence the tab is not charging, although the device was not exposed to moisture what so ever.

Now they say its some other issue for which they might need to replace the charging base.
The service is very pathetic and expensive and my tab is still not repaired.