Deficiency of services sim activation pending since 2 months

Sir/mam My Airtel Sim stopped working a few months back ,but Airtel store refused to provide duplicate Sim stating that there is a spelling mistake and forced me to upgrade to postpaid only after that I can get the same no.but they did not activated services on my new sim,I approached their nodal officer and their Appellate authority for solution but even after 2 months they did not solve the issue.somehow I came to know the store manager intentionally did not approved my sim swap application even though nodal officer asked him to activate the services . Now can I file a case against Airtel and specially their store manager ?