Welcome to the community!
Getting a higher than expected bill is never a pleasant surprise.
I understand you have the free 1000 international minutes add-on, you should note these minutes are only for specific countries.
China (including Macau)
Unfortunately, the US is not part of it.
If you are unable to make the payment in full you can contact Fido's Credit Operations team and they can set up a payment arrangement.
You can get more info here.