Everything is taking longer due to the current crisis.
The numbers for the payment management team are 0800 325 302 or 0800 902 0217.
or try these 0800 977 7337, 0800 587 4005 and 0800 090 1808
You could try Skype 0800 032 1402
Veritas Numquam Perit
Same answer as your other thread I'm afraid. You need to call them
You should be able to do it in the app which is the best option
Otherwise you need to call
Everything is taking longer due to the lockdown. Call centres and social distancing means limited staff to handle all the queries. Patience needed I'm afraid.
Other numbers to try
0800 977 7337
0800 587 4005
@DJ_Mr_Ben As per @Cleoriff's suggestion, you can download Skype for free. You can use it to call any number (except emergency services) by buying credit, and can call O2 on the 0800 number for free. You can even get a phone number so people can reach you, should your mobile get disconnected.