Constant problems on account and problems logged

Firstly every month my account gets suspended regardless of whether my debit order has gone off or not, So every month I have the same issue having to phone and re activate my phone numbers. I am on top up contracts but get told I'm over my monthly limit , which I do not understand. Before my contracts got moved to MTN from Nashua mobile I never had issues at all BUT with MTN its a constant struggle!!! When going in to stores the help is absolutely ridiculous because clearly nothing gets done to stop this problem from recurring ! Secondly I logged a complaint over 2 months ago about being billed for a 1GB recurring from December 2014 to August 2015 that I did NOT receive so I was being billed for it but not receiving it ! I got a reference number and was told they will either credit my account or pay me that money back ... I am still waiting for a response and every time I call to follow up I get told the billing department still has not sorted this out ... I NEED THIS DONE AS IN YESTERDAY ALREADY!!!! The service from MTN is a disgrace and disgusting !!!