It seems you looked at the summary of the bill which was sometimes confusing. Could you download the PDF bill and check the page 3 and 4? normally those pages have more detail of the charge and credit (if any). You could also post those here (hide all personal information before posting please).

Thanks Dinh! Looking over it, it seems that my original line is in order but the second line is missing the $20 BF credit and the $5 credit for opening a new line. 

Let me flag a rep to look into this.

Hello @Cat Le! The first $20 monthly bill credit was applied on the temporary line ending in *3 and the remaining 23 $20 monthly bill credits will appear on your new line beginning with the next bill.

As for the $5 monthly bill credit, you will see it on the next 24 bills.

Hoping you can help me too. ON Black Friday I took the deal for the 55$ - 20$ plan for 20Go, however it seems like the 20$ credit is missing from my December bills onward and I was charged $55 plus tax. 

Please create your own post and post a screenshot of pages 3 or 4 of your detailed pdf ebill from self serve that shows your plan and missing credit. Make sure to black out Any personal info