Airtel — new sim card issue

Address:91

Today i upgraded to 4g sim. I send the sms to 121 and old sim card is being deactivated and new sim card is being activated 6-7 hrs back but new sim card is giving problem. I am not able to make any call and message. New sim card is showing error code 538. I am also not able to contact customers care. Please resolve this issue.

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