This story makes no sense. Why would a dealer front merchandise? The only time that ever happens in real life is if the dealer is male, the buyer is female, and they find the dealer finds them attractive.

Also, which drugs?

Lastly, it’s extremely unlikely that a low-level dealer is going to seek “revenge” on a customer. They’re usually not gang members; just regular everyday people like you and me who are desperate to make soke extra cash.

You need to spend more time in the real world before you write a story about things that happen out there.