Credit Card Interest Raised 6.35 % when I reduce limit

Hi I had a Blue Bean Card for years that got taken over by Standard Bank. On the takeover my Interest Rate went from 14% to 17 %. My limit was R51900. On 1 June 19 I paid in R25 000 and ask for my limit to be reduced to R26900. The next month I received my statement my interest rate was increased from 17 % to 23.35 % without my concent or notification by the consultant that this would happen WOW this is ****************. I am busy reporting this to the Ombudsman too. I also paid for years R40 x 3 -= R120 pm for a service fee ( one card only) and now suddenly it is only R40 ? I have emailed Standard Bank Card division with no reply or assistance for more than a month now. Please stay away from Standard Bank Franscious Myburgh