If you press any button—say, in response to an offer to be removed from the call list—it’s an indicator that your number works and the calling company will prioritize your number on the next round, says Bikram Bandy, a coordinator of the Do Not Call program of the Federal Trade Commission (FTC). Note the name and the number on your caller ID, file a report at donotcall.gov, and call your carrier to have the number blocked. This is your right. According to the FTC, robocalls that attempt to sell goods or services are illegal unless you’ve given the company permission to send you a robocall.