Vodacom Contract

On the 21 April 2021 i call the vodacom call centre to find out how much was my settlement balance for the contract i had with them The agent adviced me to pay 3078 which i did pay on the same day.Few day later after making that payment, i went to the store to follow up if the account was settled and close.

The agent at centurion vodacom store said that there is an amount of R763 that was due to me. That means they over charged me on settlement amount.

I then logged a call for a refund and when i went to follow up on a cal yersteday 20 May 2021 , they told me they cant see anything on the screen and there is no refund and that account is settled.

Something doesn't add up here because i then requested for a statement so i can trace the 763 and they could even print a statement.

I need clarity honestly and also for the to confirm that i do not owe them anything and i want my refund.