It's possible the wireless may be turned off on your router. If it is an MTS router and there was an update or something occurring overnight to reset the device the Wifi may have been disabled. You can check this yourself if you have a device that is wired into the router. In a browser you go to the address 192.168.100.254, then depending on your device you may have to login. You would then go to the wireless section and see if it's turned on or not. Now this is just one possibility, there are several other more complicated ones that would require our tech support folks to check out for you. If you want us to have a look you can give us a call at 204-225-5687 or chat in at the mts.ca/support site. Hope this helps.
Your best bet is calling to be to call MTS support. They will walk you through the troubleshooting steps.
I recently ran into a similar issue at my parents house which required a replacement of the MTS owned equipment. The only way that was possible was with a call to MTS.
Edit: I should add that when the issue happened at my parents the WiFi stopped but wired connections still worked for a couple of days. Eventually the wired connections died too.