Survey house calls. Booooo.

So, I received a call the other day from a call centre asking me to help do a survey by answering questions and it only takes 2 minutes. I had already answered the same survey previously called by a different person, so I declined, politely! I said sorry and explained I had already did the survey and thank you at the end! That day, the phone kept ringing every half an hour... T.T It lasted maybe 6 hours in total. They are so mean!

Answer their questions over the phone or regret your actions! T.T