Bad customer services

In Jan 2014 closed my Nedbank accounts with the garage card and credit card and paid up all outstanding monies at the Wadeville branch.In Nov 2014 i received an sms that I owe them some monies.I called the call centre and told them that i closed the accounts and they gave me a reference and told me that they will reverse the payments.In Jan 2015 I still received the Sms and went into the branch at Lambton and they said that they will sort it out,I sent and email complaining about the the SMS and they said that they will come back to me with an answer.24/02/2015.I went into the branch again today a nd they said they will call me back.I left the lady a message to call me last week as well.The group of people that are dealing with my query are pathetic,lazy and ***** .All of this for a lousy R100 ,i feel like giving them teh money so that they can stop harrassing me with the SMS.I am sure i have more that the outstanding money in calls,emails and going there twice.