INCREASE ON CONTRACT WITHOUT COMMUNICATION/BAD ATT

I have a contract with Vodacom through Elite Mobile. I was paying R99 when I took the account as that was the amount I agreed upon. then the amount changed to R103.50 and when I called to check why they told me that it was caller ID charges which was not included in the contract. I left it alone. Now last month I was billed R114, I got the airtime for R114 so I thought maybe it is an error and I waited to see what would happen end of June. so today I was billed again R114, I called the 111 number and spoke to a lady there who was rude on the phone and she told me how they would have communicated with me through the same method that they would do when sending the statement. I hardly check my statement as this was just a standard contract for just airtime and honestly I never had a problem with it in the past before I upgraded. she then still mentions to me that the contracts are due to increase every year and when I told her I never had that issue before she told me that since I took the contract through Elite mobile I should call them because my contract is with them and not Vodacom. I called Elite Mobile and the lady I spoke to didn't even know about the increase, so clearly BAD