Gujarat Gas — late payment charges

Address:

Gujarat Gas Limited, Adajan, Surat, Surat, Gujarat, 395009

I used to pay my bill of gujarat gas limited (Ggl) alway online (Auto debate) through hdfc bank.
My bill of oct – dec. '19 was rs.969/- paid on 02/01/19 against due date 09/01/19. (I. E. Before 7 days). But some how, it is refunded in on 11/01/2019 in my a/c.
According to hdfc bank it is due to some technical error at biller's end.
And ggl denied that they have not received this amount & they charge me rs. 75/- as late payment charges in my next bill.
I am very particular & always pay bill timely. It is either fault of hdfc bank or ggl.
So, why should i pay this late payment charge?
It must be refunded me with interest & unnecessary harassment.

Thanking you in anticipation,

Best regards,
— jignesh shah