Airtel — no outgoing call allowed even after having validity of the plan twice recharged rs 199 and rs 349

I have made prepaid recharge as on 22.3.2018 @199 and suddenly 2-5 days before my outgoing call stopped. I have called 121 customer care and was told that you have lost your minimum balance amount. I dont know what is this??? I was unable to call so was told by cc to add min amount and you will get the validity and call on. Also try to switch off the phone and then switch on, i did that also. Nothing was changed and i was unable to made the calls once again. I have recharged prepaid with rs 349/- as on 09.4.2018 and as on 10.4.2018 the outgoing stopped with the voice message no sufficient amount available for the account.

Hope the situation is well understood. Hope you will take immediate steps with immediate effect to arrange to allow my outgoing call on and the benefit of rs 199 plan and rs 349 plan accordingly without any further delays.