Airtel — coverage problem only for my sim

Address:

Thane, Maharashtra, 421204

I have called customer care for coverage problem i am facing since yesterday. But they are not at all replying well. They said to visit airtel gallery to change the sim. I have checked 4 galleries which are closed today and still the issue remains the same, again i have called customer care but the lady is not answering properly and after explaining thorough problem, she is still asking me the that which connection i have and are you calling from different no. (It is totally understandable if i am facing coverage issue how can i call from same number) she denied to forward call to her senior and didn't register my complaint.
Very unsatisfied behavior of customer care and its service.
My mobile no: [protected] (Nikhil)