Su Zhenyu Fake Sneaker Internet

I purchase a pair of sneakers online.  When I received them I realized they were fake.  As I investigated further, it was confirmed they are not authentic.  I have been trying to get my money and I am being told no.  I was told I can get a credit for twenty dollars.  I did not pay twenty dollars.  I paid sixty three dollars.  I would like a full refund and i am being refused for two months now.  I need help.  This is not fair and this will happen to many other people out there buying from this website.  The merchandise comes from China and they want to hold me responsible for shipping which is costly therefore, they try to make me an offer for twenty dollars.  Avoiding having to refund my full money.  I do not know what else to do.  Please help.