Mahanagar Telephone Nigam [MTNL] — Phone disconnected even though no payment was due

Sir
My telephone number 25260974 of MTNL DELHI out going calls have been barred on the pretext that bill not paid I had paid the bil for the month of September 2020 on 25 October 2020 through freecharge . The details of payment are
Free Charge Transaction ID FCLA[protected]
Operator ID HGA1P128CA[protected]