My o2 log in issues

[Everets20]

What is going on with the my o2 app or my o2 in general. I’m unable to log into the app it’s been at least 5 weeks now. And when I log into my o2 on a web browser I’m unable to view anything but wifi hotspots. 
also I’ve received a weird letter in the post today stating systems have been updated and to add layers of security I just go to a web address and enter my phone number which I have and it’s stating I can use a number from my account. I’ve only ever had one number with o2 and had the same number for the last 15 years. 

anyone have any ideas? 

[MI5]

@Everets20 

Loads of issues with MyO2 just lately.

If using the app, try deleting, rebooting phone and then reinstall the app.
This is a customer to customer community, not O2.
You need to contact O2.
Message them on Social Media. Facebook (https://o2uk.co/O2CFB) , Twitter (https://o2uk.co/O2CTW) or Instagram (https://o2uk.co/O2CIG) or give them a call on 202 or 0344 809 0202 (contract) 4445 or 0344 8090222 (PAYG)
Unlikely that you'd get help in store, but may be worth a last resort try.

Guide: How to find help & contact O2