Bayport Financial services Harassment

Extremely frustrated with Bayport! They call me numerous times a day asking for someone that I do not know. I keep telling them that I do not know this person and to remove my contact details from their servers but still I get calls since I got this number (over 2 years ago). I get at least 3 calls a day and when I ask them to either put me through to a manager/supervisor or to remove my number (again) they just hang up and call me later again and don't stop until I answer.