Double debited and difficulty getting refund

You double debited me on the 30th November 2023. I called on the 1st December 2023 to alert the consultants and was advised to wait up until Monday since the debit had not reflected on their side.

Monday I called requesting the refund, was advised that the refund has been requested and I should get the money soon.

Today I called again given that the money has not been refunded and I am told it takes 48 - 72 hours for the refund to be processed, how many more hours do I have to wait?

This is frustrating, one has to beg for their money to be paid bag and understands the organizations process and flows but the very big organization is failing to understand my need for my money.