BLAKE IS HARASSING ME ABOUT THE REVOLVING LOAN FROM FNB WHICH I PAID UP

Im banking with FNB for years,i'v been their loyal client for a very long time,i had a revolving loan with them ,it heppened that i went on debts revew without my knowlegde i had to change my bank account,whoever helped me with my acountwhen i asked will FNB be able to deduct for their revolving loan i was told YES AS YOU BANK WITH FNB THEY WILL DEDUCT ON YO KNEW ACCOUNT,bt it heppened that tgey ddnt,and my account went onto areas eventually it was handed over to BLAKE AND ASSOCIATES,made arrangement with BAKE to pay i did inform them i want to settle the account,i was given the axact amount to pay and i paid,unfortunately i still kept on getting the annoying calls from BLAKE to settle my account,of which i kept on telling then same thing that i have settled my account and eventual a guy said SORRY we will make sure you get a letter from FNB that states my account has been settled,but im still being harrased by BLAKE calling me everyday regarding this account ,the last person called me today said my account isn't in order when im telling her its orobbly been a month since i settled that account ,i want to know HOW IS MY ACCOUNT NOT IN ORDER WHEN I WAS TOLD BY A MEMBER OF BLAKE THE EXACT AMOUNT I NEEDED TO PAY AND I DID JUST THAT,im now waiting for a letter that my account is paid up up but now im being told ITS NOT IN ORDER,WHATS THAT SUPPOSED TO MEAN? May be its time to leave FNB cos i cant be harrased everyday for the money i paid