Telkom not to be trusted

I took an LTE Unlimited data contract for R449 per month from Telkom online in May. Three days ago I received a statement that I owe R516.81 for September. I called them and they told me something that I cant explain as i don't even understand. They said something about reducing R3. I know nothing about those technicalities and I never signed for that. This was never explained to me when I took the contract. If Data is unlimited per month how do I get to exceed the limit? They further told me that I have subscribed to some Wats Service that I know nothing about? I told them that when I took my contract I never subscribed to anything they must cancell that and pay back my money. They always say their calls are recorded they should listen to that recording and tell me when did i ask for a subscription. The lady who helped me told me that they can't cancel that subscription on their side I should do it myself. I tried to follow the instructions that she gave me to cancel that but I couldn't find the steps she gave me. I had to go online, google on how to cancel the nonsensical subscription that I know nothing about. This is daytime ******* and cannot be tolerated. I want my money back. My subscription is unlimited for R449 and in my layman's understanding there is no way i could have exceeded something unlimited. I'm fed up with them as I wasted my time and struggled to get rid of something that I never subscribed for.