Daily Harassment and useless assistance

I have been getting calls from this company daily for months now, and they are looking for a customer who does not own my number. I have requested on several occasions that my number be removed and no one has ever done that, I spoke to a lady by the name of Miss Ngobeni, that said she doesn't know what her teamleaders surname is, she just know its Sandile, and there is no manager available for me to speak with to assist. To top it off she asked me for my number to confirm which number needs to be removed, which is what every other consultant does everyday, sometimes twice a day. This is harassment and I am sick of it, how can this issue run for over 6 months, and every business? I have asked them to enter my number on truecaller to confirm that the number does not belongs to me but it falls on deaf ears!