Airtel — SIM chip failed suddenly not working

Address:

Vanastalipuram, Hyderabad

My SIM card has been stopped suddenly and not working from 2 days. I have visited the store at Vanastalipuram, Hyderabad(vanastalipuramaor.[protected]@airtel.com) . The SIM card is on my brother name, its a postpaid family member connection. My brother is on abroad. As per the process, my brother has shared all the required documents via email as above mentioned. ut the store person was saying that it will take 10days time for the approval of documents and activation of SIM and if I ask why 10 days time they are talking rude and it's not possible to activate do what u want. I am really disappointed with airtel this kind of service.
1) why my airtel sim stopped working with out my mistake. Chip failed is airtel issue.
2) The store persons are not polite and make customer to revisit multiple times.
3) Why it should take 10 days time. If the customer shared document has any issue just point me out on that blindly don't tell 10 days time.
4) store person saying, i[censored] want to complain give complaint.