MWEB Staling Money by pre & post billing - Paying for one service twice

MWEB billing is a nightmare. I am currently being both pre & post billed. So being charged twice for both last month and the coming month. So I always owe 2 months at a time. Worse than this - as it has been happening for 6 years. Accounts say I must speak to billing, billing say I must speak to accounts? They refuse to log a call, they refuse to listen. And every month they threaten to disconnect and so I have to pay again. And then to add insult to injury, Vumatel is down today and no one told the subscribers / victims of the lack of service. I have requested they do not bill for today!? SO I guess they will bill twice.