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The idea is you have two providers (double the cost). In any event you lose a primary connection. You have redundant system to fall back on.
Tri band router hosts one 2.4ghz band and two separate 5 GHz bands.
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Don't be discouraged there are still things you can do if you want to try messing with this that won't cost you much, if anything at all other than some time.
Obviously you already have telus so... if there is a telus WIFI hotspot http://www.telus.com/en/ab/support/article/telus-wifi-public-hotspots accessible in your area you can connect to this and use it as fallback (dual) connection, this would work in case of issues with your DSL modem or Telus' ability to send to it.
Optionally you can do the same with a neighbor's (preferably a willing ones) wifi connection.
Best of luck!