Originally Posted by MSPeconomist

Normally this is correct, but could the colleague have given the hotel a SPG number? Some hotels have even tried to convince the additional guest to open an account in such circumstances, but regardless if both rooms were booked as a single reservation under your name, you stayed in one room, and you paid for both rooms, you should get points/nights/stay credit for both rooms.

If you have the folio showing both rooms, submit it by email to SPG research.