National survey phone calls

jeshope18

Hey, 
ive just recieved a phone call from 07879665419; they stated that they were national survey and I have recieved phone calls of this company before on different contact numbers each time and have asked them to take my number off their calling list however this time was different; today I had a male contacting me with an american/canadian accent and as soon as he stated that he was calling from national survey I asked him to take my details off their calling list to which he responded “I will not, I will call you back to back, back to back, back to back” his tone was threatening and I responded by informing him that if he did this I would contact the police and report a case of harrassment and I havent recieved back to back calls however I just wanted to prewarn people that if one of the callers are using threatening tones I dont think that the company are legit and just be careful. 

Combesy

How do you stop getting these repeated calls from National Survey?