what? Have you been hacked??

They don’t

How do you know it is eBay and not some random scammer pretending to be eBay?

You will need to contact eBay and report the call

What was the reason for ‘them’ to contact you by phone in the first place?

You’ve posted the epilogue.

What led up to the action you describe? In what context? How do you know it was eBay?

If you start from the beginning, we’ll have a better idea of how to help.