from the mts website
"MTS Bill Upgrade

MTS will be making our billing system upgrades beginning August 22. During this time period, you may experience longer wait times – both in stores and on the phone. As such, please note the following dates:
Evening of August 22 & all day August 23 – We will be unable to provide any wireless support.
August 24 to August 28– Our stores will be open but we will have a limited ability to serve you.
We recommend that you call or visit us before August 22 to minimize any inconvenience."
source:http://www.mts.ca/mts/mts+bill+upgrade