Capitec Bank *********** people

Had an issue with capitec bank regarding less interest paid to me even though the interested rate never came down. The branch acalled the office and the query was escalated. I made 2 calls to the office and afterexplaining and waiting the call was cut off. Nobody returned the call. Today i call and was told there is feedback but the consultant reading the feedback to me cannot explain it. and again the call is lost. The first time i approached the bank was in n1 city andthe consultant told me the interest rate came down. which it did not. I tild her even if the interest rate came down the interest cannot be R900 less. Then she said its because of the days. some months have 31 days. How does 1 day make such a huge difference. I went to a different branch the following day who called the capitedc office. Still my query is not solved.