My O2 number registered to unknown email address

[Nitz]

Hi

My mobile number was with Virgin and they automatically transferred to O2 sometime last year. 

Now, I tried to register my number to O2 by registering my own email and linking to my mobile. However, O2 gave me a warning that my number had been connected to this email address *****95@o****.uk which I don't recognize at all. 

How to solve this issue? As I want to register this number under my own valid email and not some random email. 
Thank you. 

[madasaf1sh]

@Nitz 

You will need to call customer services on 0344 809 0202 or 202 or send them a message on Facebook (https://o2uk.co/O2CFB) , Twitter (https://o2uk.co/O2CTW) or Instagram (https://o2uk.co/O2CIG)