Normally it is harder to get through the 24小时客服热线 on the weekend, just give it few more trials. IF it was over-charge, they'll fix it for u! Calling Mobile overseas are expansive, it does costs $0.6x or $0.8X for Mobile in England.
I believe the Montreal call is being transfered to the 1-8XX# after Xminutes. I normally call the 1-8# instead of the (514)#. Have a nice day!