Application of the notice period and penalty for early exit of tenancy

Dear Sir,

I am renting a house in Dubai. The yearly rent is paid with 2 cheques. I have been renting the house for 8 months. The landlord has already cashed in the 2 cheques.

My tenancy agreement includes an exit clause for early termination: "In the event of the tenancy contract being broken by the tenant, he/she will have to give the landlord 60 days' notice".

The tenancy agreement will end in 4 months. I informed the landlord that I will leave the house within 60 days. He told me that he will not refund the remaining 2 months. What should I do?