Payment on wrong account number

I paid money into the wrong account number. I have been trying to get the amount credited and transfered into the correct account. It's a simple request. Yet after numerous emails (this after managing to get the email addresses of two people in the accounts department) nothing has been done. I am now being harrased by lawyers over this account. I refuse to deal with the lawyers as I have been paying the arrears on this account directly toTelkom. All I want is get the amount transfered into the correct account, get an updated statement, pay and get the service reinstated.