hi jacob, I'm going to guess this is about being able to upgrade to a new plan, you should be able to contact 202 on this matter, I would suggest when calling, to wait for an option 6 (which says anything else)
if this is to do with settling a phone in terms of a bill that has gone unpaid, please contact our payment management team on 0800 902 0217.
alternatively, you can now come in store (if its possible and safe for you) and you can discuss this with one of our store advisers.
link for more info on payment management:
https://www.o2.co.uk/help/account-and-billing/payment-support#:~:text=You%20can%20check%20any%20outs....
thanks
will