MBD is harassing me

They phone or sms me like 10 times a day trying to get hold of someone else. Each time I have asked them to remove my number and they say that they do, but it never happens. I've already blocked like 50 of their numbers but they keep calling me from newer number. I really feel like laying harassment charges against them because it's been going on for months now. I've asked numerous times to speak to a manager and they never ever put me through. Staff are rude and useless.