increase in spend limit without consent

In June this year we received a message from telkom that they will like to increase our monthly spend limit to R250 to which they said we shud respond with a yes or no, I then responded with a NO as this phone is for my 12 year old son and the extra spend limit is not necessary. I recently found out they have been charging me from July for this addition which I had not requested and when I called them the lady told me she can't help with this but did cancel the addition for october. She told me to contact Consumer watch if I'm not happy. I did try but can't seem to get hold of any1 who could help. I did not request this. They took out R921 from my account this month and said the services r off and will come on in 72 hours. I feel that all this has caused unnecessary problems for me and the break in service for my son. So I will not recommend Telkom mobile. I have had an mtn contract for over 6 years and didn't have any problems like this.