Airtel — 15 nos of existing sim not working - replacement required

Address:

Coimbatore, Tamil Nadu, 91

We have made a complaint at airtel office, coimbatore, tamil nadu for replacement of 15 sims which in problem.
They are not agreeing to replace.
Plz send some one to replace the existing sim.
We are having nearly 90 connections from you for our group companies.
If this problem continues or no co-operation at your end, we will change all our sims to other network.
Plz act swiftly.
G. Sathiyanarayanan
General manager