EA help offers phone, live chat, and email options, although email tends to be slow and not very helpful. Phone calls may not be available until Monday business hours, depending on whether you have your own help center in Canada or have to go through the U.S. one. Live chat is always available; if you don't see the option, try changing your location to U.S.
https://help.ea.com/en/contact-us/
But it's probably not necessary to go the EA help route. You can login to your husband's account and register his Monte Vista code to the store, or you can use a cell phone as a temporary wifi hotspot and let him do it himself. Codes are tied to the account, not to the computer used. Downloading will be a bigger issue, since store files are encrypted. But if you have an external or thumb drive, he can login to his store account, download MV, and then transfer it to his computer. (This doesn't always work, but it's worth a shot.)
The key is for you to temporarily remove your own game folder from Documents and then open the launcher to spawn a new one. (Make sure you're not logged into the launcher.) Then he can access his store account, download MV, and grab the file from Downloads inside the game folder. That file should be transferrable to his own game folder, where he can install without an internet connection.
Also, it's a good idea to try installing into a clean game folder first, just to make sure it works. The file will still be in Downloads after it's installed, so he can move it from one game folder to another without any trouble.
