I was refused entry from Calgary International Airport CBSA…

I was refused entry from Calgary International Airport CBSA Immigration on November 30. Then I left Canada on December 1.
I am in Japan now.

I had been Working Holiday Visa (August 21, 2011 - August 22, 2012) but I didn't work in Canada then. It was just learning English and sightseeing because I was brought enough money from Japan. I could staying until August 22, but I went back to Japan on July 8 from Edmonton because It was impossible about find job within a month.
I was going to go to Edmonton for meet my friends and dearest on November 30, 2012 - January 1, 2013. I was going to stay at my friend house during this trip. They asked me about my friend information, and then thay called to my friend. So, maybe they thought I'm renting the same house before and I will trying to stay longer because I still have some friends in Canada but they will be leave Canada soon because my friends are most all international student. And they called my boyfriend too.
And then, they were checked my baggage and Email and text messages, then they holding my iPod touch, phone, camera, money, wallet until I signed on the paper about "ALLOWED TO LEAVE CANADA".
-> Pursuant to paragraph 42 (1) of the immigration and refugee protection regulations, I am allowing you to withdraw your application to enter Canada and to leave Canada without delay.

Also, I came to Canada as a visitor Oct 12, 2012 - Nov 4, 2012, but had no problem. I thought I could go to Canada for totally 6 months. However, they couldn't accept my immigration this time.
I didn't have a visa and no reason to visit in Canada because I was a tourist. So, I guess that it probably looks very suspicious to immigration. And I don't have a job in Japan right now, I am single, and living with parents in Japan(→I don't payment rent fee myself) that sounds like no reason about I'm going to definitely go back to Japan on January 1st but I had a E-ticket (for round trip) though..
Anyway, they never said reason about reject immigration and they didn't enough explain about immigration rules. It's unfair!!
And they were holding my passport and one of my baggage until I leave Canada. And they stole my working holiday visa from my passport.. I don't know why. So weird..