They've called 2 or 3 times today.  I say hello, and then they immediately hang up.  Probably trying to collect active numbers for telemarketers or something.

Same experience as Sara. They said they were calling from a local charity and wanted to speak with the head of the house. I asked them which charity they were with, andthey said one that helps people in need. At this point, I told them to pack a lunch, but I am still receiving four to five calls a day from them. I called both Sasktel and the police and neither say they are able to do anything about them.

this is who is calling you.  don't ask me why.
Xentel Telemarketing
Regina, SK
2024 Albert Street, Unit A
Regina, SK,  S4P 2T7
Tel: (306) 347-7410
Fax: (306) 347-7419

They have limited staff and an autodialer - and so if no staff are available to answer when you pick up, the autodialer hangs up. And calls you later.

347-7415 calls 2/3 times per day.  Hangs up after I answer. Today a lady was at the other end.  I told her to strike our number off her sheet.  She said this was the first time she had called.  She said they were a new charity but all charities in Regina use the same phone number???  I told her this may be the first time she has called but many have called from her number and apartment.  She got very nervous that I knew she was calling from an apartment.  Lucky guess on my part.  Again, I asked her to remove our number.  She told me to quit yelling at her and hung up.  News to me that I was yelling.  I dialed *57.