The normal procedure is for the balance being used against the next month's payment
Otherwise
You can reach the Payment Management team on 0800 902 0217.
The opening times are:
Monday to Friday – 8am to 8pm
Saturday – 8am to 6pm
Sunday – 9am to 6pm
https://www.o2.co.uk/help/account-and-billing/payment-support
This is not O2 and we are all customers here similar to yourself and cannot answer account type queries.
