Telkom ********* and unprofessional

I have a mobile router meant to be billed at R147 a month with 10G anytime data. Last year I had a problem where they deducted R500 from my account saying i went over the data WHICH WAS MEANT TO BE CAPPED! When i called they said it was not capped and only put it on then. This year was an upgrade and when I spoke to the consultant I stressed to her that i wanted this capped and not have the same incident. Now it has happened again this time R650 being deducted. When I called to inquire they say there is no record of it being capped. They do not give you confirmation of your arrangement at all. There is no reference number for the call and the consultant says they can only give their full name and surname as a reference. This is completely unprofessional! How do you know that we are not being given a false name? Apparently you only get a reference when there is an escalation and my problem is not an escalation. I am beyond upset now, i will never take another Telkom contract.