Is it legal for the landlord to ask for a rent higher than the RERA index?

I am a tenant and for the last 3 years, my landlord has been arguing about the rent. I always say I will pay as per RERA. Last year in Jan 2022, he gave a court-attested notice to sell.

All year he has been threatening to throw me out and not to renew if I don't agree to his demands of an 80% rent increase. He has only done 1 viewing in the last 12 months (the property is not listed on any website).

He is willing to let me stay if I accept an 80% increase in rent, otherwise, he is asking me to leave (refuses to give this offer in writing).

He is saying he has enough evidence to show he tried to sell and after I leave he will keep empty for 2 months and then rent it out. I have emails from past years.

During this year, I have had some WhatsApp messages but he is refusing to give the actual renewal offer in writing.

If he gives me a drafted Ejari physically & gets my signature first before signing himself, will I still be able to take it as evidence to RDC?

Or will the RDC say I have agreed to the new terms by signing the new Ejari?