"it actually provides your number to offenders" is false. The DoNotCall Registry works on voluntary compliance like speed limit signs on highways. Honest telemarketers honor the Registry, abusive telemarketers and scammers do not. They may be calling randomly or if you've provided your number for a freebie (money-off coupon, drawing for a car or vacation, gift card, etc.), buried in the fine print may be authorization to release your number to third parties.