Not interested in resolving my isssue

On the 29 March I complained about my credit card debit interest going up by 2,75%. I took 8 days for someone to respond to me telling me that the did not increase my interest rate by more than 1% as per the interest rate hike. Rep**** to Irma with proof of the rate increase with snippets from my credit card statement. The next I get an email from a different person stating that they are considering the matter closed. Without interest or willingness to ask for proof or to investigate or checking that I'm happy. To date I have not had a reply either persons at Absa.