Terrible service

I have had an account with standard bank for a few years and had a terrible experience with them over the years.I switched banks about a year ago and had not closed my standard bank cheque account. Having forgotten about the account I did not realize that I was still being charged for banking fees .I had not been contacted even after 90 days to advise that there was an outstanding amount on the account. Surely the bank has a collections department and can pick up where there are outstanding amounts as this is the purpose of the collections department, to date I have not been contacted directly by standard bank regarding the outstanding amount no phone calls,emails or letter of demand. This morning I received an sms to say that the account was handed over to attorneys for debt collection. Upon calling customer care I was told that it is my responsibility to inform the bank of my standing which I acknowledge however it is the job of the collections department the sole function is to collect outstanding funds and if not 1 consultant has contacted me then clearly they are not doing their jobs. All of this could have been avoided had I been informed about the outstanding amount sooner and they amount would have been way less.