Still am not clear on some things.

how many bags did you check? That is still missing.

If you checked two bags in PHX, and two in YYZ, you should have been charged $200 total - $100 when checking in at PHX on Dec. 5 and another $100 when checking in with AC in YYZ on Dec. 8. I’m not sure what ‘legs’ you are referring to. You had a stopover in Toronto, and any fees paid in PHX would not carry over to the flight back to EU. Had you been going straight from PHX to EU (less than 24 hours in YYZ), there would have only been one charge from AC.

just curious…what did you check on the original outbound flight in MUC, and what did they charge you?