Bad customer service

I have data contract with Telkom, which I took is was a deal of the month, I called to cap it, as a I went over my limit, today I got debited R639, while I pay R139 monthly am told my account is no longer capped, which I don't understand, as I was told its capped, the other agent by the name of Palesa, said even if my account is capped I can still go over my limit, and the only way for my account to be capped I have,to go to their sales department, not over a call, and my account was never capped, while the other agent said it was capped, and it was changed to uncapped. This is not my first incident with Telkom, previously some one took 2 expensive phone in my name and my email address was changed on their system, the sad part is that they can't even explain what happened, am given lame excuses,