Returning an item when the seller doesn't accept returns

[je32207]

I received my money back from eBay because the item wasn't new but was sold as new.   I visited 4 different shippers to get estimates of return shipping costs to find the cheapest way to return the item.   Then I contacted the seller to advise them of the 4 estimates.  The seller is supposed to pay the return shipping costs and I am not going to return the item until the seller puts the cost of shipping into my PayPal account.  It has been over a month now and the seller won't respond to my emails and I am still carrying the item in the trunk of my car.   How long do I have to wait for the seller before I can just do whatever I want with the item?