Hra exemption related

Hi,

Could you please let me know if there is any provision to claim HRA exemption incase the owner refuses to give rent receipt and PAN no. The owner is ready to give rental agreement indicating the entire amount(18k) for rent with advance deposit(1.8L). He has also asked to pay rent half in cash and half in cheque.

I dont have enough time to search for a new house as my employer is not ready to give more time.

Please suggest is there any room for exemption if it is to claim a lesser amount.

Best Regards

Srinivasan DK