Contact eBay Customer Services, ask if they are sending these messages, and what do you need to do to stop this happening.
Use this link to contact eBay Customer Services.
https://ocsnext.ebay.co.uk/ocs/cusr?query=1455
Scroll to the very bottom of the page and you will see the options, Have Us Call you and Chat With Us, and an approximate waiting time, it's usually a few minutes.
Lines open today between 8 a.m. and 10 p.m.
