Curse a few times before ringing them and explaining you needed it tonight and demand they apologize You are disappointed but try to make a new plan You get so angry you think of some way to punish them for this You ring them up and give them an earful. The cheek of it!
Zap a wet one in the microwave for 2 minutes every day and replace it every 2 weeks. Better yet, use cloths, towels, and rags that you can toss in the washer or clean with bleach.