The abbreviation for Canadian Dollar is CAD, not CDN. Sometimes C$ or CA$.
I checked Valve's website for an email address to let them know but it seems they have scrubbed it quite deliberately. This is not a surprise, it's something we see all the time with scale: if a 100 person company can have 100 million customers, they will happily do so and gladly take their money, but never scale up enough people to deal with this extreme staff:customer ratio. Google, FB, etc., we know they all have terrible customer service and that this is the reason. Seems with Valve it's the same.
I checked Valve's website for an email address to let them know but it seems they have scrubbed it quite deliberately. This is not a surprise, it's something we see all the time with scale: if a 100 person company can have 100 million customers, they will happily do so and gladly take their money, but never scale up enough people to deal with this extreme staff:customer ratio. Google, FB, etc., we know they all have terrible customer service and that this is the reason. Seems with Valve it's the same.