Negative amount on invoice

[FranSam]

I recently changed provider (from 02 to Giff Gaff) and on my final invoice, the balance is a negative amount (in credit) and when I access My 02 Business it says = This invoice is payable on or before 11/05/2024 although, to date, I haven't received anything yet. 

I am no longer an 02 customer therefore I can't call the 02 Business numbers to speak to Customer Service. I would be grateful if someone could please help. 

[madasaf1sh]

@FranSam 

You can still call them, you just need your old account number, there is nothing anyone on this customer community can do to help. 

Guide: How to find help & contact O2 

[MI5]

@FranSam 

Credit will be returned to your bank account through the direct debit if you have left it in place.

https://www.o2.co.uk/help/account-and-billing/refunds