The legality of changing the unit from a hotel apartment to a residential apartment

I bought a hotel apartment on 25/11/2014. I received the apartment on 27/11/2018 with a delay of one year. Even though I decided to receive the unit on 12/2/2020.

I received an addendum to the sales agreement to change the unit from a hotel apartment to a residential apartment.

My questions:

A. What is the legal point of view? Does the unit value various between a hotel apartment and a residential apartment? And how much is the difference?

B: Meanwhile, I entered with them on 26/12/2018 to run the hotel apartment on 12/2/2020, they sent the addendum and stopped showing any income from that date till today.

I called them but they never reply so I called the auto service number and they told me that the rental pool scheme is stopped and is not working.

I asked them to hand the key to my representatives to rent the unit they refused. They said you have to sign the addendum and change the unit to residential. What should I do?