Counterfeit Salomon Speedcross 3

[a_i_mckay]

In August 2015 I bought 2 pairs of 'Salomon Speedcross 3' trail running shoes, from a seller in China.  I have only just tried to use them for trail running and was very surprised to find that I experienced really bad knee pain (normall I am fine with neutral support running shoes which the speedcross 3 should be - road or trail shoes).  I had my concerns that perhaps the item was not genuine and I have discovered this to be the case.  These are counterfeit Salomon shoes - a local retailer confirmed this for me when I took them in to the shop for comparison.

I am wondering what I can do about resolving this issue.  I cannot open a request because it's some time since I bought the shoes.  However, I feel that I've been cheated by a counterfeit seller.  I am really unhappy about this, especially as I raised concerns about authoenticity with the seller before paying to return the items and receive a larger size.

Is there anything I can do here?  Please help.

Thanks in advance.