I keep a couple of bamboo barbecue skewers in each of my humidors to open up plugged cigars. You have to be careful to keep the skewer straight, or else you will pierce the binder and wrapper. It usually works.
Sometimes you get a hard draw 'cause there is one plug in one spot. Some judicious squeezing can often open it up, but be careful not to crack the wrapper.
Sometimes the cigar is just wrapped too tightly. When that's the problem, you need to try the skewer/piercer method. Sometimes that works, and sometimes it doesn't.
Sometimes the draw is too hard 'cause the cigar is too moist. That's the situation where tossing it in the humidor, or maybe even a dry box, for a while will fix it.
Sometimes, none of the above will work. That's when you mutter some obscenities and just toss the sucker into the trash. I have a cigar buddy who brought a box of ISOM Upmann's to a herf last year. The ENTIRE box was irreperably plugged. It killed me to admit defeat and toss mine out... :riflefire