Credit limit increased without consent !!

I am not happy, I have been with MTN almost 3 years no and really want to leave, All the months I was with MTN I had no credit limit usage because I can only pay a fixed amount per month, suddenly I received my bill October and the credit limit was automatically set at R390, without my consent.

On my last of many calls to MTN ref nr 1- ********** 7755 the lady told me they sent me a sms saying that this was automatically increased and I should have rep**** "No" on the sms sent, I don't even read all my sms.

According to my CPA knowledge a credit limit cannot be amended without any written consent or authorisation .

I will not pay the extra amount that they have billed me for no reason, and will not leave it here.

Please be aware of this people !!!