Invoice and rude Call Centre

Good Day, <br> My invoice from Jan 2016 show a my account is in a credit of R 613.25. Today 29 Jan 2016 they sent me SMS indicating that I need to pay R4102.67 or my service will be suspended. When I phoned the call centre I was rudely told my debit orders was returned because I cancel the dt orders with my bank and I don't know how to read my invoices. This is unacceptable and expected a more professional service from this service provider.<br> <br> I would appreciate if you could intervene as this is unacceptable and would like this invoice to be resolved<br> <br> THANK YOU<br> Andre Koegelenberg <br>