Harassing phone calls

Homechoice has been harassing me with marketing calls consistently for months now. I have never shopped at a Homechoice in my entire life and have never given them my contact details or permission to phone me. So, I believe this is *******. I have pleaded with the sales consultants to stop, blocked them from many numbers but they still keep calling. I would like these calls to stop immediately and for Homechoice to explain to me where they got my contact number from as I NEVER gave it to them.