How did you pay? If you paid by Paypal then they will investigate but if you paid by cheque then Ebay won't do a thing as seller is no longer registered.
There is one way to safeguard yourself in future against this happening again. Always pay by Paypal but make sure that Paypal uses your credit card to fund the payment. That way if there is a problem you go straight to you credit card company and they will refund you and recharge Paypal.
Paypal hate this and do everthing they can to persuade you to use a bank account to fund purchases. Always pay this way as Ebay don't give a toss.