EFT reversal.. Poor service

I called the customer service number at the bac;k of my card on the 21/12/2020to reverse an EFT that I made on the 19/12/2020 @around 21:45 cos I selected Absa bank instead of FNB. the agent told me that the money should be in the recipient's account even if I selected the wrong bank as the account number and reference is correct. I found it odd and wondered what is the point of selecting bank nAme if the funds would still be transfered regardless. I told her (Emily ) that but the money is not reflecting and it's fnb to fnb. she then said payments done over weekend take 2 days to clear but I have been transferring from Fnb to Fnb for years including weekends and holidays and it reflects immediately. I then asked that we reverse and she said it will cost around r300 (forgot the exact figure). well that was more than double the amount I transferred. she then said alternatively she will send it for investigation and that takes a day and someone will call me. to date I didn't receive any call and this has not been resolved. it is really bizzare that i can reverse an e-wallet but not an eft transfer. why can't fnb have it that we as clients can reverse on the App/online/cell phone banking. those should offer convenience but that is not the case.