Disappointed customer

I had made a payment to settle my store account. However I had mistakenly sent it to the wrong bank account. I contracted my bank to do a reversal / recall request and they said that they are not able to because the funds were used up and its too long. I thought that the banks assist customers in these types of scenarios and contact the third party to send back the funds, instead all I got was poor service, agents that could not communicate clearly or offer any guidance or assistance. This is by far the worst bank with the most *********** staff. I have had the worst experience dealing with them and to top it off I am yet to get any assistance regarding my query. It seems like there is no one who is competent enough to properly investigate the matter. It was human error to add the wrong details but could the bank not assist in any way shape or form to obtain the funds?