Change of rebate account requirement not communica

As of January I noticed new banking charges on my account. I use a Gold account with the extra requirement that a R 10 000 balance is maintained - this therefore gives me a rebate on my fees. As of January, however I was charged fees for this account. On enquiring at the branch the teller herself could not understand the reason for the extra charges. On referring to her manager it was explained that the balance required to maintain this rebate benefit is now R 15 000. Such a substantive change in this accounts terms and conditions was not communicated to me ( the balance requirement of R 10 000 has been in force for at least 2-3 years). On enquiring how such a substantive change was not communicated to me, as a holder of such an account, I was informed it is my duty to inform myself of such changes. On enquiring when & how such substantive changes had been communicated to me, the clerk took my details and said she would get back to me. 24 hours later I have not received a response. My concern is the failure of ABSA to communicate clearly to clients about specific, substantive changes related packages the customers are utilising. Disappointing communication & customer service.