Fill out a proper scam accusation.
These Starbucks cards are stolen/cracked, I assume? If that's the case then you both ought to lose your money. Sorry, I don't have much sympathy for either end of these deals.
Looking at his other posts, it appears to be the case.

I am not yet scam anyone. I promise, i will pay. I notyet paid 48$ with only 1 people. I earning money. Do you think profit is so much?