No help from help Desk

They used an old account of our suppliers and gave to a new client. We paid money into that account and want it back. We have managed to get the name of company but STANDARD BANK REFUSES TO REVERSE CHARGES. We sent proof of payments and we get no support from the bank. Very bad service. This has carried on for many months with no success. They will not assist us with the query. We have contacted the company who was given the account number and we will have no choice but to name Standard Banks customer if we dont get feedback.