Potential froud by standardbank

In 2013 I received my retirement package and I decided to settle home loan with standard bank I went to the bank and requested a statement upon receiving the statement I wnet to standard bank protea Glen to settle the loan I paid n and received a statement saying the account is settled now years later I'm getting statements from the bank saying there's outstanding amounts I don't know how this is possible whereas I've paid of the loans when I go to the branch no one can explain what is going on I'm being sent from puller to post please assist as this is a really pressing issue Contact number ***