I worked (very, very briefly) at a telephone survey company. Do Not Call lists are completely ignored, as they specifically cover only telemarketing calls. At the company that I worked at, calls were dialed randomly. In most cases, a refusal would simply merit being placed on a list to receive a call back at some later date. The only way someone would not receive a call back would be to make a sufficiently negative impression on the surveyor that they would mark it as a "Hard Refusal". In training, we were told to do this only if they became noticably angry. Some surveyors (myself included) would typically mark someone shouting about a Do Not Call list as a hard refusal, but this certainly isn't universal. Further, it's possible that the same survey company will still call you back, simply about a different survey. Unfortunately, this means that there is absolutely no way to totally prevent unsolicited calls about surveys. If you want to take the effort, I would recommend politely telling the surveyor that you aren't interested at all and ask them to indicate that you don't want to receive a callback. It's still not a guarantee, but it's probably your best bet.