Abu Dhabi Tawtheeq cancellation of tenancy due to faulty AC

I would like to cancel my tenancy contract which is valid until 30 Jan 2021 without any notice as the central AC of the building is damaged and the room temperature inside my apartment is over 33 degrees C.

It has been like this for over 2 months. Some days the humidity is over 70%. Other flats in the building have a fixed temp of 25 degrees C but the AC controls don't work for anyone.

A team did temp repair after rigorous office visits but these works last for less than 1 week only. The advance of my annual rent has been paid until 30 September 2020 and the next/ last cheque is due on 01 October. Contract expiry is 30 Jan 2021.

The real estate company is neither willing to repair nor willing to refund my advance paid as well return the cheque which is due in October and has never responded to my phone and several emails sent.

I have several emails sent about this problem (in the English Language). What are my options? What proof would be required?