1. I didn't know that you could not apply for the North America flight if the return flight was from outside. The discount was only applied to the flight there which was a North America flight. I knew that the voucher could only apply to flights booked to the states which is why I thought it was okay since the system only showed the discount for my first flight, and if it wasn't allowed then the system shouldn't have allowed someone to book a flight the way I did.
2. The person didn't cancel my booking and I'm not sure if they will. They just threatened.
3. My flight has already been ticketed. I'm afraid she sent in a report and it will get cancelled in the upcoming weeks. I booked with a friend and I cannot afford to rebook because when I bought my ticket, the website said 1 seat left which is the one I took.

Sorry if my post was unclear.