Vodacom incompetence and additional money debits

@vodacom, even though I have settled my account, paid what I had to, followed the instructions as was set out by Vodacom, it's been two months of my account ongoing. Emails and phone calls doesn't seem to work, how do I deal with the incompetence?? I have paid the settlement yet I am still being charged, so effectively Vodacom is deducting more then what the contract states.