[Resolved]  Jet Airways — double billed for excess baggage

I am travelling on pnr no. Hghlam from bdq to bom on 25/07/2018, flight no. 9w-414
I went to bdq airport counter on 23/07/2018, as i wanted to pay for my excess baggage of 15 kgs. At the counter i was informed that they no more do it at the ticketing counter and i have to get it done online, on jet airways website,
I logged in jet airways website and entered my details and purchased for 15 kgs of excess baggage. I entered my debit card details and after transacting clicked on proceed.
After the process i got a confirmation that the amount was deducted twice i. E for 30 kgs. I immediately asked the counter official to check and he confirmed that it is deducted for 30 kgs[protected] — 15 kgs, and[protected] — another 15 kgs) but he could not refund.
He advised to call the contact centre which i did on [protected], and spoke to one mr. Fahad and requested him to refund me 15 kgs excess baggage which he denied saying that this is non refundable.
How can it be so? I had clicked on 15 kgs, and the transaction happened twice, and i immediately called all concerned, it was not any delay on my part. This is so wrong on your part to say that it is not refundable, this is not a ticket, but it is extra baggage. And when we are talking of digital payments mistakes do happen, so please look into the matter and refund me the excess of 15kgs which you have billed.
Expecting a immediate refund, since it is my hard earned money and my intention was not to request at the boarding counter but travel with all ease and pay the airline for my excess baggage rather than argue at the boarding gate.