A lot of pet shops, the big chains especially, source their pets from huge scale small animal breeding "factories" where welfare is nil and disease is rife. P@H are notorious for this, and also for importing diseased stock en masse from the continent.
I'll wager dollars to donuts that that's how your poor little hammie ended up with mites!

Makes you quite angry and sad doesn't it?
However he got the mites, I hope he gets rid of them soon
