Incorrect ref. on deposit slip - no feedback

A deposit was made 4/5/15 at Kromboom branch. 1 September, we received a notice from the Attorneys the amount of R500 outstanding. My husband went back to the bank advised the deposit was done in May but the reference no. was incorrect. The lady at enquiries said it would be escalated. I received a Service request no. via sms on 8/9/15 due 14/09/15. On the 14/09/15 another sms: still in progress. Today I received an email from the Attorneys for the demand of the outstanding amount. I called the call centre and spoke to 3 different people( Jabu, Moffat & Raylyn). Only to be told no one can assist me. I need to contact the branch where the deposit was done. I held on for 20 mins when the consultant transferred me. Hung up called again, held on for 15 mins, called again and held on 15 mins. In the interim I have incurred costs with the Attorneys for the sms' and emails they have been sending me. Could someone please assist me with this matter.