Xiaomi India — sim slot problem and servicing issues

Address:

New Delhi, Delhi, 110001

I have purchased minote4 32gb and 3gb ram, 2 months back and all of a sudden it stopped working, there might be some problem with its sim slot because no signals are tracked whenever i insert a sim in it then i went to the service center but got no fruitful result... Its been 15 days since i left my phone there still no positive result, all i got to know is the phone will take more time to fixed... I have never experienced such an awful service before.