Finally after talking to multiple people and dozens of phone calls, I got justice
My Owner Advisor said she was OOO and the delivery team missed to call me when MR was discontinued. I still don't know why they responded weirdly when I called, but bygones are bygones. She apologized for the oversight and escalated to the store delivery manager. They were able to get me a 2019 SR+ (Red/Black) with 19" wheels, which was allocated for their store demo. I checked the car and it looks perfectly fine with just 12 km on it. They comped off the red paint ($3300 CAD), so I pulled the trigger. Taking delivery today - super excited!!
Original order date: 2nd March 2019 - SR+, Blue/Black, 18" with AP
Changed order on 4th March 2019 - MR, Blue/Black, 18" with AP
18th March 2019: MR discontinued
30th March 2019: Offered and accepted SR+, Red/Black, 19" with FSD.