Update:
I called them a second time (after writing this review). Talked to an agent much nicer than the first one and he reduced the changing fee $50 to $375, which is still too much. Due to this, I update their rating to three star. Still do not recommend them.
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I need to change my flight dates and I find out that the minimum change fee for a flight is CAD$ 425 with no cancelation possible. Even the agent says that changing the ticket would cost around buying a new one.
Sad thing is the company's bad reputation was mentioned while I was referred to their website
By a third party. Will take this notification more seriously next time.
I suppose the technology has helped us to shop our tickets online versus through agents, but then we have to be careful to get our tickets from trusted websites, so skam companies like this one do not rob us off.
Last but not least, this one liner 5 star reviews are most probably done by the company itself to bring up the average ratings in search results. Can't trust them at all.