Overcharged interest rate

FNB Accidentally sent me someone else home loan account statement account number: *** which raised concerns to me when I noticed that these person is being charged 9.90% interest rate and I'm charged 12.25% interest rate on my home loan. I called FNB for explanation but they didn't give me answers. Where as from February I was charged 13% interest rate when I called and asked why the consultant told me they don't want me to be in arrears it didn't make sense but since it was my first time to take a home loan I kept quite. But since I've seen that other person's statement I've noticed that FNB is ripping me off. And its ******* also to charge interest rate in advance according to the usury act. So would like FNB to be fair and treat its customers the equal please reduce my interest rate to 9.90%. These whole thing proves that Emerald van Zyl was correct about the whole allegations he made about fnb mortgage bonds.