Daily badgering sales calls - I'm not even a customer

For the last few weeks, I have been called on average once a day (sometimes more often) by your sales department because someone (not me) has put my number on their account in error. I've never been a customer of Homechoice and you should not have my number on your system. I've asked numerous times to be removed from your system and the 1 time the request was actually acknowledged, I received an SMS to confirm. That was weeks ago and I'm still getting daily calls. Every time I've been able to answer I ask to get removed again, the call "drops". This is at best poor business practice but actually more like predatory sales behaviour. It's unacceptable.