Indraprastha Gas Limited [IGL] — payment made in dec 2016 has not been updated up till now bp no.[protected]

I had made a payment of rs 696.00 against invoice no.[protected] dt.13.12.2016 through kotak mahindra bank vikas puri chaque no.000014 dt 19.12.2017 had been credited to your kotak mahindra bank a/c no.[protected] txn no. M356968 dt.20.12.2017 at 5.08 pm
Scan copy of my bank statement had also been sent to you many times but of no avail.
I had also registered numerous complaints but they can't able to locate the payment & adding it to the next bill with late fees.
Now they are sending the massages to make the payment to avoid disconnection.
Even after paying the bill before due date they are mentally harassing us
Please look into the matter & oblige

Thanks
Lakesh chawla
Bp no. [protected]