bad customer service

i got a cell sim card contract with vodacom for almost a year and they miss one payment on my side and they block the network on my side not working and not connected at all but when i call them or call customer service they say they will debit double on my account on the 28 October ,i ask why because its blocked am not using it now why u not connecting me so that even u double debit it know or understand that i was using it so vodacom it doesn't have good customer service to their customers and very selfish other network like Mtn the don't block you but come month end u pay double