Migration from FNB disaster

My account was migrated from FNB. Normally debit order ran from the 25th as usual. But I have been getting messages from Discovery bank that I have not paid.

I was denied access to my profile on the app because the normal payment has not cleared on their side. They said it should take 4 days to clear, but this was never a problem when I banked with FNB.

This negatively impacted my credit score and it looks like this will be the case every month.

Don't I have the right to refuse this migration?