Help peeps!!!

I listed my BMW M3 Evolution last night and i've had a few enquiries and bids. I've logged on this afternoon to check how things are progressing and after putting in my user name and password it came up that my details 'weren't valid'. Perplexed i quickly checked my In box only to find that i've listed a 2005 Audi A4, a 2005 BMW M3 and i've just apparently listed a 2005 Range Rover. I've sent a mail to eBay but what else can be done ??? I feel like i've been hi-jacked !!! Has anybody else had this happen to them and, ifso, what did you do ???

Regards

James