No one can block a call for you. You are the only one who can stop them - Do not answer unknown calls and do not call them back. Consider getting a call blocking device (or app for your cell phone)-they're available online and start around $50 or so. http://800notes.com/nb/search?q=call+blockers
Also take a look at: http://www.wikihow.com/Block-a-Call
I've blocked this number (after they called from this one) and 12 other numbers this company uses - but they just call from another number. I answered this time and said, "Respectfully, what do i need to do to be taken off your calling list?" Person said, "You have no student loans?" I said, "No, what do I need to do to be taken off your list?" (I have student loans, but this is a scam.) Person said, "You have no student loans?" I said, "No." Person said, "Well there you go," and hung up on me. I hate them, and I don't hate anybody. I wish i knew who they were.
No one can block a call for you. You are the only one who can stop them - Do not answer unknown calls and do not call them back. Consider getting a call blocking device (or app for your cell phone)-they're available online and start around $50 or so. http://800notes.com/nb/search?q=call+blockers
Also take a look at: http://www.wikihow.com/Block-a-Call