What happens after a seller denies refund request?

[seabass541]

I am having difficulty with a seller and trying to return a pair of shoes that were too small. I requested a refund and the seller was being rather obstinate in their demands for return, including that the post office master "needed to inspect the shoes for damages." When I called the person out on this they declined my refund. I am looking to see what I can do next? All I want to do is return the shoes/get my money back. Can I contact eBay and have them step in to help? What about their money back guarantee? 

[gosimus]

@seabass541 

< return a pair of shoes that were too small ... Can I contact eBay ... What about their money back guarantee? >    

Generally, "doesn't fit" is not covered by the money back guarantee.  Was the size misrepresented?  Does the listing say that the seller offers returns or does it say no returns?  I would need to see the actual listing to give informed advice.  Can you provide the item number?   

[seabass541]

124892495652