Gujarat Gas — Billing payment issue

Address: Bharuch, Gujarat, 393002

My customer ID is[protected]
I paid my October- November bill through HDFC bank RS. 585/- on 2nd December 2016,
but when my DEC-Jan bill come along with the previous bill amount 585+556=RS 1141/-
Which means payment is done but in your system it is not updated
because in my account it shows transaction is done.
Please kindly contact me about this.
Wish you look forward to this.
Will tell you in detail.
Thank you.