Who are they, they call all the time but I do not answer?

If you no longer want to receive phone calls from UW, pick up the next time and call and say "I do not want to receive calls from UW anymore, take me off your phone list." That's the only way to get them to stop.

If someone keeps calling you from UW and you have no affiliation, pick up the phone and tell them that you have never attended or donated to UW so that so they can erase your number from their system.

Please keep in mind that these are students calling you. I worked there and can tell you all that the students do not enjoy disturbing people, they are just trying to pay the bills while they're in school.

Same again, thanks.

No message was left.

This is precisely why anything 519-888-* we let it go to the machine.  If it's someone calling from UW with actual business (as has happened with my wife in the past), they will leave a message.

they keep on calling me everyday around 6-7pm. does anyone knows how to block this phone no?

Yep, it's Waterloo.  They will keep calling you, and calling you, and calling you, until you pick up and say that you do not want to donate.  I was a donor for 15 years, but when they called me in January for the new year campaign right after I wrote a cheque in December, I told them that I was no longer a donor.   They were ok for a year, but recently started calling me again.