Day light *******

Telkom have been robbing me every month , their monthly statement for my mobile package varied from month to month , yet my internet usage remained virtually the same. When I took the contract , I set the spend limit to R20 . But now when I queried the bill that I am going to pay at the end of the month , I am told my spend limit is R500. As a result , when my data ran out , it's kicked into that spend limit. Now I have to pay my normal montly bill + R500 for out of bundles. I have had it with this ******* . My contract is due for next year February and won't be renewing it.