Can the tenant refuse the rent increase after sending him the legal notice on time?

Hi,

My villa is rented since August 2018 for 155000 pa, payment was agreed upon by 2 cheques, and Ejari was registered in 2018.

In August 2020 (COVID Time), I was outside the UAE and the tenant asked me to lower the rent to 142000 and offered to pay monthly rental payments by bank transfer.

Due to the COVID situation, I accepted his offer by email and since then, the tenant pays rent monthly through bank transfers.

In April 2022 (which is 90 days to renewal in August 2022), I sent him an email to rent review as the rental value for my villa increased.

However, the tenant did not agree and kept saying there is no rent increase for my villa. We exchanged several emails. and no conclusion.

Now in October 2022, I have obtained a rental valuation certificate from DLD which states the current rental value is 200000.

I will appreciate your advice about how to proceed with the rental increase, and what is my legal position in this issue.

The tenancy agreement and Ejari are officially not renewed for the last few years.