Xiaomi India — complaining about my redmi 3s mobile

Redmi 3s mobile is suffering from a problem that when i insert the sim card insert the my mobile it shows no service available.
So due to this i had gone to mi service centre which told me it will take 5 days to repair my mobile and will charge about 550 rupees.
Not going to there after 5 days and submitted the charges after still then my phone problem was not resolved and they have grabbed my all the money.
So i think i should go to the case on the company🙅🙅🙅🙅🙅