Airtel — bills not regularised

Address:

9/71 Netaji Nagar, NSC Bose Road, 700-092

Please note, i was using airtel postpaid data card no - [protected] till[protected], i was advised by m/s pinky no - [protected], airtel store at tollygunge, ashok nagar to switch to the 50gb slot, i paid rs 620 till that day charge and closed the old no, ie [protected], and a new number was allotted to me, [protected], i paid rs 600 on[protected] first day of my bill cycle, subsequently on[protected], i paid rs 440/-, receipt no[protected]. On[protected] i paid rs 600-00 receipt no [protected], for my datacard no - [protected].
Today surprisingly, i received a bill from airtel on my old no -[protected] a sum of rs588.7, due to 24th june 2019 payment last date[protected].
I am totally surprised what type of service airtel is providing its customers,