Are you certain the messages are connected to Ebay?
Depending on the content, it could be an attempt to defraud you and nothing to do with Ebay. Do they use your actual name when they leave messages and what are the messages about?
In 20 years, I have never been left a message by Ebay on my mobile or landline.
If Ebay don't have your number, they definitely won't be contacting you. Check what details they hold about you here:
https://accountsettings.ebay.co.uk/profile
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)
