If you are checking in at a location where QR has contracted out check in services, I suspect that the only thing that will matter is what it says in the ticket

I think that your email would be stronger if it didnt have leading questions - I would so on and ask simply 'I have a reservation ABCDEF - could you please confirm the baggage allowance in this booking" - that way you can have more confidence that the person actually checked your specific booking. What does the booking say if you check on the Malaysian Airlines manage booking?