E bay madness!!! HELP!!

[GRIFF55]

Hi all, during today after loads of password changes and reporting all 60 odd item numbers someone has still gained access to our ebay account!!!
they have bid on mobile phones only with max bids of £999 on each totalling £60 grand in one day. they changed our email address on the account too. Ebay have made most null and void today but not all.
We are unable to contact anyone to sort this shit out.

Has anyone got any ideas what to do or seen this sort of scam before?

cheers