Good luck finding it. I'm searching right now and only came up with a USA article:
"EBay is even worse. In between overpaying for Pikachu and PlayStation 2, I've looked high and low for a customer service number. According to a company spokesman, you can always call the main number -- if you can find it. It's not listed anywhere on the site."
http://www.usaweekend.com/01_issues/010520/010520techsmart.html
I'll let you know if I find the mysterious "Main Number"
OK, found this off a website:
PLEASE use discretion and common sense when deciding which method to contact ebaY. Use the least agrressive first ebaY's contact form or Safe Harbor and then escalate to suit the situation. Misuse will only cause ebaY to change their phone numbers.
2005 Hamilton Ave.San Jose, CA 95125 NOT Confirmed
2125 Hamilton Avenue San Jose CA 95125 NOT Confirmed
2145 Hamilton Ave # 350 San Jose, CA 95125 Confirmed
Hours: 7:30am to 5:30pm PT (California USA Time)
1-408-376-6554 Fax Main - Confirmed
1-408-558-7404 -Fax Customer Support NOT Confirmed
The Following Numbers have been checked and work -
1-800-322-9266
1-888-749-3229
1-877-438-3229 (California only)
1-408-558-7400
Hours 7:30 AM 5:30 PM PT M-F
Know Persons Extension press 1
Dial by name Directory press 0
Customer Service press 2
Operator press 3