Network cut off without reason

My dad's debit order for Vodacom goes through on the 15th of every month. On the 9th of July his network got cut off. He phoned Vodacom to find out what's going on and they said that his account was not paid, however the debit order did go through on his bank account, just like every other month. Vodacom customer care services just told him that they can not do anything to help him. This is absolutely ridiculous. Now he is completely cut off and can only receive incoming calls.