Calls my land line incessently. What can be done to stop these people?

Calls all hours - when you call back, it offers to let you delete your number from their faxing list but then requires an extension, which of course I don't have....

fax from Douglas Publications about Golfing events. Please remove me from this list

in the last 2 days i have gotten over 15 calls from (416) 847-1150, i have been getting calls from this number for over 2 years, they sound like they are comming from a fax, i have tryed to find out where the call are comming from, but have not been able to get that infromation. i just want the calls to STOP!!

I tried During business hours all i got was a beep sound .I tried this during non business hours (like 11pm)and then i hear an IVR . I followed all the steps given above 00000 and then the phone number. and I got the confirmation telling that my number will be removed.. within minutes and I got a call, and i keep on getting calls as i am typing this. ... I guess it probably takes a lil time to be removed..