Horrible service

I recently got my statement only to see that my phone contract had drastically increased, I have two contracts one is about R350 and another is about R200 but they were both R400 so i went to query at the gateway branch why the amount was so high he said that the contracts increased by maybe R10 - R20 only, upon further inspection my account had been changed from the R10 overlimit on the usage one phone had a R200 limit while the other had a R4.09 overlimit not only that but he said we had made alot of calls,smses,data usage and had alot of content services. Firstly i almost never use my smses i currently have 400 also i watch my data and minutes if it gets low i topup before i hit the end and the other phone is for my mother who is even more cautious than me, the agent gave us the phone code so you can see what content you were subscribed to and the phones came back saying we had subscribed to nothing. This is ridiculous i mean firstly R200 increase is INSANE the bill has NEVER gone that high in the year i have had these phones now all of a sudden it is like this and secondly who changed my account settings, i had to sit there with him while we redid my account billing again??????