No proper investigation with account, I want it refunded with immediate effect!

I opened a contract with Telkom in March by the help of Jason Hansen that assisted me, he was very helpful and I couldn't fault him anywhere, he answered all my questions and he put me at ease with any concern that I had,however, for the past 2 months I get SMS notifications whenever my data for the month has depleted and I'm also notified that I'm now accessing out of interest bundles so to speak but last month I haven't received such an SMS and then the next thing I get an SMS to say that I have used my spend limit for the month which is R100!!! And my account is already R539 making it an easy R639+ on my account, I called in to the call center and explained the scenario and I made it clear that I will not pay for something that I was not notified about prior to the spend limit being used up, I see this as negligence from telkom not sending my notifications in this matter. After this case that has been logged I get an SMS to say that it has been resolved with no explanation as to what the outcome was I HAD TO PHONE IN MYSELF TO FIND OUT WHAT HAS BEEN RESOLVED, WHICH SHOULD HAVE BEEN EXPLAINED IN THE SMS IN THE FIRST PLACE!!!!! Only to find out that it got declined, bearing in mind for something that I didn't not know about yet they "claiming" that I was aware that I was going over into my spend limit. I got my account recently and I want that R100 refunded back into my account or you will be faced with legal action I don't care if it's just over a measly R100. GET THIS SORTED NOW!!!