Spending limit increased without consent!

This morning, I woke up to discover that my account had been over-billed by R300 - more than my normal monthly charge. Upon calling the 8ta call centre, the agent I spoke to informed me that the reason for this is that Telkom had sent an sms to advise that the spending limit had been increased. I never requested or approved this increase from Telkom and I was simply told by the agent that the R300 cannot be reversed because of the usage on that specific number. For something I never agreed to! <br> <br> I find it underhanded of Telkom to effect a spending limit increase on my account without my consent and this is not within my rights as a consumer. The phone in question is being used by a family member as I have two phones with Telkom so I didn't even know that the limit had been increased until I saw the debit order on my statement this morning. Totally unacceptable! I feel so violated as a consumer. And this is not even my first billing complaint with Telkom.