Discovery doesn't care about your privacy

The discovery group gives the impression that they do not give a damn about privacy. I have asked to stop receiving sales calls from them, but they ignore me. I have even put in a complaint and was just told to add my number on the do not contact registry. Why on earth would I need to go through effort on my side when this is my personal phone number and you obtained the information *******ly and have been contacting me without my consent? Now I have to keep adding my name to the registry to avoid these calls? I have blocked probably in the region of 12 of your numbers already, but still you find a new number and just keep on phoning. After at least 40 blocked or dropped calls, can you not take a hint? Are you THAT desperate or do you just not care if this is raising privacy concerns? Where on earth did you get my contact details in the first place? I do not bank or invest with you.