Momentum is such a disappointment for such a big organization

I phoned Momentum on the 21st of April requesting them to refund me money that I had deposited into their account with an incorrect reference, as they had already debited the same funds from my bank account. From the 1st day i spoke to the call centre agent I was assured that for a long as i do not reverse the money that they debited from my account, i should be refunded within a certain number of business days. My question is, in 2023 can you really have a system that takes 5 or more business days just to do a refund? Momentum is such a disappointment.