Absa service DISGUSTING

I am disgusted in Absa. They offered me a lower interest rate in March 2020 on my credit card. It came down for 1 month and went up to the normal rate again even though at that time the interest rate came down by 1%. So my interest rate was higher than normal interest rate. I am battling with them for a year now. Early March I received an email stating that from 27 March 2021 my interest rate will come down by 9% which does not agree with the rate the offered. The calculation was done incorrectly. Now when I received my account my interest rate still hasn't come down. This is ridiculous. I also requested that they pay back the rate over charged which off course did not happen. I feel that they have to refund.