Closure of account Ref no ***

The bank that changed every thing! I have been trying to get a credit card account closed since 5 Jan,2022. I tel & requested closing figures. I was told it takes 8 working days to close acc- they dont call Sat a working day.. I cant believe this, I worked in a commercial bank for 31 years & it could be done the same day. I tel 3 times still same answer. 8 days after I received an e-mail with the closing balance R139.25. I paid it that day18 Jan, 2022. I thought now I would have a nil statement.. I checked on their website there was a bal of R2.38 on 19 Jan, 2022 so paid hat on that day. I checked to day 19 Jan, 2022 now say I owe R2.51. I will not pay this