standard bank charging me more than the agreed terms on home load - second time complaining on same issue

this is the second time im on this platform to complain about the same thing with regarding to this bank. all i got with my first complaint was the aubot response from this email and a generic email with questions that after i answered the system said my problem had been resolved. im still being charged over the agreed on interest rate on my home loan. 7% versus 7,43% is a big difference on a home loan. even the home loan calculator on the bank site says i should be paying less monthly on the agreed on 7% than i am being charged monthly the banking system does not have clear communication channels and emails go unattended to with generic replies that someone will make contact to discuss the problem. my home loan account number is ***, that amount that is being debited from it every month does not equate to a 7% interest rate. i would like to this to be fixed and for a FORMAL invoice showing the corrected debit order amount and for the extra payments that i have already made into this account to be corrected for...