I have an issue with the item I received

Help i bought an item here, its nba 2k17 steam key…it says global so i asked if it works in US Country he said yes it does, so i bought it, but when i tried using it it says Not Avaible in my country…please can anyone help me get my refund? i didnt rate the item yet

Open a dispute for this item so you’re covered by the Gameflip Guarantee.
Check how at https://gameflip.zendesk.com/hc/en-us/articles/115000885633-How-to-open-a-dispute-