India Post — Paid twice for a single service. No refund received yet.

Address:

Dum Dum Post Office 1800 11 2011 https://maps.app.goo.gl/dWMgoPR3JVmQAU6c7

I had gone to DumDum Post office to register a parcel from Kolkata to Assam, address for the post office is given below-

Dum Dum Post Office
[protected]
https://maps.app.goo.gl/dWMgoPR3JVmQAU6c7

I had two boxes to be delivered (approximately 11kgs and 8 kgs weight). I was charged Rs. 690 for which I opted Gpay payment. The PO official told me that the payment had failed online but my account showed that the amount was already debited. He told me that I'll receive the money within 2 to3 days and made me pay cash for the parcel.

Today it has been over a week. No payment has been received/no refund has been made. I've the debit details with me and also the receipt of payment says that payment was made in cash.