Yes, back in 2017 I was buying an Exora for my wife, that time Proton was clearing Exora Turbo Premium stocks with lots of discount and freebies. So I paid the fee to book the car and proceed to bank loan, then the SA kept saying the car is coming so I wait and wait until after 1 month plus the car finally arrive. But then the SA told me that was the new Executive Plus model instead of Premium, so all the previously promised discount, free maintenance services, etc. were not valid anymore. So not only I can't enjoy those discount and free maintenance service, some more I need to pay extra for the new model (because the Premium model is priced lower than the Executive Plus due to the discount). I wasn't happy then but my wife was in need for the car (because she trade in her old car already) so I still accepted the car.

He said Premium got stock, so I buy from him. But only when car arrived he said Premium no more stock, only have the Executive Plus.
I rugi the 4 airbags (Premium 6 vs Exec+ 2), 3 years free maintenance service, and have to pay extra a few hundreds ringgit; gain some aesthetic and nvh refinement on the Exec+.
I blacklist that SA straight away.