@JoyLuck I don't really have a comment on that one. Just quickly looking at the screen shot posted. Looks to me that all 30 day plan data 1.5 +500 was all used up.
I can only go by my old plan when I was on the 1 gig long time ago.(which is still same plan today) It was 500mb and if you added auto-pay for 500mb bonus.
These did not appear as two seperate lines of data.
It appeared something like 500mb + bonus 500mb =1024.
So that op. Likely is a bit confused in their statement saying I loose out my 500mb plan bonus data because of these add-ons. It probably says something like. 1.5gigs+500mb =2048
And they used it all up.
As for Data add-ons being used maybe they work in different order as they're just data add-ons. So if it's the newest add-on that starts to be used first or the oldest does not really make a difference. It's just a data add-on.
For this OPs case since his question was about calling minutes. The system would not technically use a more worthy add-on (International calling) for a Canadian call when they have 1000 long distance Canada minutes.
The system would use those minutes first and not touch the 500 Intl one unless the OP calls on Int'l number.
A quick example.
If he talked 30 minutes to a Canada number. Then 30 minutes to a USA number.
Then 1000 Canada LS would have 970 minutes left.
The 500 international would have 470 left.
System won't use an international add-on whether it has been on the account for years or just brand new gift for the holidays if there is another add-on sitting there that is Canada wide minutes.
Same would go for $5 for 500 Canada wide minutes that many have and 500 international gift minutes. No matter how many times you call a Canadian number system will use the 500 Canada wide minutes and not touch the international minute's unless all other minutes have been depleted or you call Int'l.
If that makes sense.
