A minor billing dispute between eBay Inc. and one of its customers, San Francisco litigator Richard Hardack, has escalated into all-out war. Their battles began nearly two years ago when eBay suspended Hardack's account amid a $58 disagreement and Hardack took eBay to San Francisco's small claims court -- the first time. He's since filed two more small claims suits against the company, the most recent in February. This week, eBay sued back.