Constantly being spammed

Really getting super irritated with the constant phone calls! I have blocked multiple numbers already and still they manage to phone me everyday!! I have never ever expressed any interest in the company so I have no idea where they got my information. I’m still not interested in the product, the constant phone calls will not change my mind! Even if I reject the call, they just keep on trying! This is starting to feel like harassment and nothing I do changes anything!