Airtel — sms incoming & outgoing service not working from 5 days..

Address:

380015

On my 1st visit it says our 4g system not working.. On 2nd visit says not available sim cards after then i update sim from another branch sim service start after 2 days.. Now sms service not working.. While i say to representative she says its banned for 48 hours for security reason.. I wait.. Then after she says your new sim card not reflected in system when i changed.. Its reflect after 1 days so 48 hours not complete.. Then i wait now n 4th day its say its have technical issue and not resolved.. Now saturday sunday not working our technical dept. So please wait more 3 days.. What is the issue i don't know how airtel service work... Its not like corporate service.. It doesn't know customers mobile number sms requirements.. Now sim card also closed not service its show... So much bad experience with airtel...
I have updated my sim card as 4g as per instruction by airtel its my big mistake..