Tenant is not agreeing to increased rent as per the RERA guideline. What to do?

I bought a villa without viewing it on 30-12-2022. It was rented at AED 75,000/year (contract expiry 23-03-2022).

The previous landlord served an eviction notice (Sale) in September 2021 to the tenant for 12 months.

He also sent an email 90 days before the expiry of the tenancy agreement to the tenant informing him that "the rent increase will be as per RERA guidelines and by him or the new owner if he managed to sell the villa before March 23, 2022".

Last week, the tenant sent an email requesting to renew the contract and then on WhatsApp chat he agreed to a rent renewal at AED 100,000. When I sent the tenancy contract to him on WhatsApp, his lawyer sent me a legal notice:

1. Forcing me to renew the contract with AED 75,000 and not as per the RERA increase which will be almost 95,000. The current market is AED 125,000

2. Not allowing me to inspect/view the villa and if I insist, then he will take legal action against me

What should I do?