Non existent support

I'm a Telkom subscriber for the SmartBroadband 80GB Internet bundle.

For the last 3 weeks every day R3 is added to my account at around 11am. I have called several times to ask for assistance with regards this problem. Every time I'm told that it's sorted out and won't happen again and then the next morning same story. This amount gets deducted from a Remaining spend limit which starts at R500 every month and for which I never asked. Whatever is deducted from this amount gets added to my bill. I don't know what else to do except cancel my subscription and go to another service provider because nobody on their call centre can help me.