Debited twice - Refunds takes 2-3 days. How when you made the error

My account was debited twice R199 X 2 on payment day. I called in and explained the issue and that the extra money they took was for a critical personal use on the day and that it was imperative that I have that money is paid back into my account on the day the incident took place.. It is unfortunate to mention after having spoken to 3 service agents that they did not care about the inconvenience they caused and rather told me about the 3 day waiting period. I even suggested an option of immediate payment or cash as the amount was already in their account. Appalling treatment considering the fact that this was their mistake. FYI "processes were made by people and will be changed by people". & "customer really comes first when you have made an error" but I guess Melon Mobile practices company first!!!