Incorrect statement from eBay

For some months each time I go to bid on an item a message appears that I have a history of unpaid items & so are barred from further activity.
Have no idea what this is all about as I have never owed anyone any money. Have bought successfuly on eBay for over 20 years & sell very little. How do I go about unravelling this mystery ?

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Do you allow anyone else to use your account ?

 

(Or can anyone else access your account )