Continued Billing Error

Its a pity what MTN says is not what they do. Below i specifically said, they will put through a debit order for Jan fir the same invoiced queried. While i got an asuring response on hello.peter to say my issue has been sorted and i since got an sms saying i owe 4900 to which again, i have no idea what comprises the value. Now, R4900 has gone out of my account. How do i pay for my other bills? How on earth is my issue sorted when im billed incorrectly 2nd month in a row. How does one live and ignore such. How does mtn itself explain this. This isnt an error, its blatant stupidity by those doing the billing and handling queries. Im really g###tvol and im gonna take legal action. This im certain cannever be within law. I mean iv queried this over and over and yet again.....! I wish to have no further dealings with mtn. Not with the silly account nothing. You guys are seriously f###ng me up. You guys are not only incompetant but foolish to realise you lost a customer. A flippen loyalist to mention the least. No more, no more am i dealing with you. Iv been charged incorrectly since my upgrade to now. No more..no more no more i say gaaa......