Airtel — deactivation for no usage

Airtel deactivated my number for not usage for 90 days though there was a minimum balance of RS 20 as mentioned by trai...I contacted airtel for the reactivation of the number .They asked me to visit the relationship center to get the activated duplicate sim..When i visited the center they refused to give me the duplicate sim.They said you can get a new sim but not retain the number which was deactivated...Airtel wasted my entire working day...Its the worst company in the business