they swap information between any 2 parties in a transaction with each other
the information they give is what YOU put in your details when registering with eBay as your Contact Number.
if this is a problem you need to change your contact information (via the Account Tab) to show the phone number you would be happyfor eBay or a buyer/seller to contact you on
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~~ ~~ ~~ Those who do right, have nothing to fear.