Airtel — bill generation

Address:

New Delhi, Delhi, 110001

I hav ported from airtel in d month of nov 2017 and recently received a msg from airtel stating that a bill of 534 rs was pending.. It was also sent to my current subscriber idea.. And they threatened to barr my no unless i make d payment.. This amount was settled by me on 31 dec 2017.. Yet again i hav received another msg from airtel saying that a bill of rs 233 has been generated.. This is sheer loot of customer's money..