What do I do if I buy a preroll and it isn’t smokable?

Probably not much you can do especially if 24 or more hours have passed since purchase just bust it out and re roll it lol

I have noticed you may have to reroll them sometimes.

Call the location and ask the question. Be prepared to tell them why it's not smokable and how long you've had it and why you didn't call them first, but asked Google it what they do.