Interest rates

Having a huge concern regarding my Aspire Current account interest charged. Used the account to purchase online only to find out at a later stage regarding interest charged on those purchase. See below just a summary from my bank statement with interest charged versus the purchase amount that its more than 55% charged. Its unacceptable to charge 55% as per the NCR regulatory . Interest charged its more than even a loan shark

R110.58 - interest R90.00

R245.44 - interest R135.00

R376.20 - Interest R180.00