Negotiating with a seller since Sep 2017 to either provide the item purchased or refund. ideas?

I purchased some material in September 2017 from ebay. The seller sent material not advertised. When this was raised with the seller, they offered to send the right material. When it didn't come, they offered to provide a refund. 

Seller has not provided refund, keeps saying they have, and 6 months later i have no recourse to Ebay, can't leave negative feedback, but can't get the item I purchased either. 

can anyone help?

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If you paid by PayPal you have 180 days to open a case for INAD.

But you better be quick if that deadline hasn't expired.

Why on earth wait soooooo long ?

I wouldn't let anything go beyong 60 days max.