Multiple missed payments to Vodafone for unrecognised phone number

I am tearing my hair out with this. My credit score used to be excellent, now it is 'low' beacuse of a series of missed payments to vodafone for a phone number I do not recognise. 

I can't get anyone on at Vodafone to discuss this with me on the phone because of security, I have been into a vodafone store and they have identified the account in my name, but can't give me any more details about it. 

It started last year and in the last 7 days my credit scopre has dipped 54 points according to credit Karma. 

Has anyone expereinced anything like this? I'd really like to know a good place to start.

thanks for any advice/pointers


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