A landlord is not abiding by the RERA calculator and wants to increase the rent

Dear sir/madam,

My landlord sent me a notice 95 days before expiring of the contract that my rent has been increased by 40% without any justification. I informed the landlord that we should abide by the RERA calculator and sent him an extract of it where it is clearly stated that no increase in rent for the property.

After going back and forth multiple times, I decided to visit RDC. They suggested submitting an offer and deposit which got approved according to the RERA calculator.

I sent the certificate to the landlord and he replied back that he rejects this.

What should I do next?

Can I get Ejari with the offer and deposit certificate? Or do I require a tenancy contract with a signature from the landlord?