R25 000 Money paid to wrong account

I sent R25000 into a discovery bank account of the person I do not know the payment was not immediate, I called Capitec to try reverse the transaction since it was not immediate but I was told to wait 7 to 21 working days while they still investigate. I have done the same mistake with standard bank few months ago theoney was in my account after a few minutes.... What's wrong with Capitec that such things they aren't able to solve. The last agent I spoke to said money might not come back. I am so ****ed of with the service of this bank. Such mistakes happen everyday but they are not able to resolve in time. Please I need to reverse these funds.