Mastercard support is useless as well.
Our Credit cards were stolen October 20th. It took forever to get a hold of them to block the cards. They did get blocked but also that also screwed the online access up "Sorry we can't show this information, try again later". Couldn't check on the status of new cards while the support said wait 15 days before contacting us.
15 days were up, still couldn't get through online support. It just kept going in circles and in the end I found a way to contact them by email, except it was by email on the site, which just gave an error code.
Back on the phone, finally get through the automated nonsense to speak to a person and it turned out they haven't even send new cards yet. They just blocked everything. That took multiple people on the phone to figure out, but finally got a somewhat competent person online who could also fix the online access.
So back to waiting another 7 to 10 business days for new cards.