Random phone number showing in account details. Can't change it.

Hi,

I logged into my account to check the phone number and that marketing consent was set correctly but the phone number shown is wrong. It's not a phone number that I recognise. Hopefully this isn't another customers phone number as that would be a rather serious data issue?

I've tried changing it and get a message to say it's been updated but then I refresh the page and it goes back to this random number that isn't mine. It would appear from numerous forum posts that this issue has been going on for a couple of years?

I also wanted to enable marketing calls. I ticked the box, clicked save and it told me I had opted out?! Unticked the box and it told me I had opted out. Ticked it again and was told I'd opted out. It would appear I can only opt out but not opt in?

Is there anyone that can help here? Thanks!