MSI: Harassment

How can I get MSI to stop phoning me (and from a private number)! I get a phonecall every few weeks - and this has been going on on/off for years, even before they changed their name<br> <br> Do they actually believe I'll turn over my credit card details just to get them off my back?<br> <br> Besides, I've already read the HUGE number of complaints about their products and business practices and are not in any way interested. <br>