Take it from me mick,file an electronic claim through ebay right NOW.
Time is against you here,so don't hesitate.

Tell ebay on the submission form that you've already contacted the seller & it is not as represented.
Tell them also that you want a full refund from the seller,including shipping back,and that the seller has said she won't pay for that.
..that is why you've now contacted ebay.
They will emai you an ebay prepaid address ticket,that you print out on your computer and tape to the box.
When you send it back,ebay will be notified via the post office,fed ex,UPS etc. that you did so.
When it is recorded of being delivered to the sellers door step,you will get your full refund via the way you paid.