I'd be curious FIRST to hear their explanation of this...is it possible they were maliciously hacked? These days, you never know- people with grudges or who think they're being 'funny'? And a busy vet's office may take a while to get to their emails- that's true of MY own vet, so personally, I'd call them A.S.A.P.- if it's what I think, they'll be very grateful you did.