I know how to fix this problem for everyone on this list!!!
First of all this is a 3rd party company that processes computerized data faxes. This is computerized and will continue until the fax goes through. The simplest solution is to switch your fax machine to answer on this line until the fax comes thru. Once the fax is received successfully, the calls will STOP.
I accidently gave my phone number instead of fax number to someone and could not get these to stop until I figured out that if I would just plug my fax machine into the actual phone line and receive the fax it would solve the problem and it did...haven't had anymore calls since the fax was successful!!!!
Now if you don't have a fax machine I would go BUY ONE, otherwise prepare to have your phone ring all DAY!!!
I keep getting this number over and over again and every time I answer I get a fax signal! I tried activating call rejection but was unable to do so. Just wish someone would create a website where we can type in a certain phone number and it's automatically blocked and the person responsible for the number gets a fine for soliciting unwanted phone calls!