Hidden cost and no Settlemnt letter

I requested a settlement amount which was given to me , i logged the homeloan account and settled it .On the 03/12/2019 the is a statement the showed i owed standardbank. R 780.00 which i paid as i urgently need a settlement letter. i made numerous request for the settlement letter and constantly referred to assigned Attorneys. The account was held by Standard bank and not the party referred to. Today 04/12/04 Boom! I still owe R961. 85 even after paying R780.00. I urgently need Settlement letter while they follow the tittle deed process.