I just looked at your feedback and this nasty cow pushed you down to an undeserved 75%.
Which is pretty much a poisoned account.
While I would still wait for the delivery and then leave a Response, followed by appealing to eBay for removal of the feedback, in the short run you can build feedback by buying.
Choose sellers who appear to leave feedback on shipment, and buy stuff you would normally be buying for around the house. Specialty candy, tampons, cheap earrings, toner ink, salted almonds, books, DVDs of Crazy ex-Girlfriend or Brooklyn99, single issues of vintage comics, hair dye, chocolate marshmallows, knitting patterns.
The immediate feedback will help mask the damage.
