Why was the bill allowed to go so high?

I HAVE a 24-month contract with Telkom that usually costs about R850 per month. In August last year, I received an SMS to please call a Mrs Bowers as the account has reached its limit of R10 000, only to find that my grandson was buying data on my account for which I did not give permission. My account is R18 000 from August.

I have been trying to get answers but no one can tell me who allows so much data in a matter of 10 days. Every time you call Telkom, you get a number with no action. I am still paying my R850 per month and my line is cut. I handed this matter to my lawyer and still no answer. Icasa called and a lady by the name of Sakhumzi spoke to me in December. I explained but still no answer. Today, they told me because I’m a good customer they allowed the bill to run up. Who takes responsibility that my grandchild took the SIM? I want to know why was the bill allowed to go so high when I did not give permission to Telkom? Please help. Mr E Logan