HARASSMENT !!!

I receive a call from Homechoice almost every single day. To make it worse, they even call on a SUNDAY. Which I'm supposed to be protected against due to the Consumer Protections Act. I've asked them on numerous occasions to remove my number from their calling list. Why do I need to make use of third party apps to block their number. when they should respect that I'm not interested in any of their products and I don't want them to call me at all !