need clarity of refund of token amount to buyer as deal cancelled

Dear Sir / Madam , We wished to sell our office space in mumbai and found a buyer . After negotiation we concluded on a price and he gave us a cheque of 50,000/- as token money . Balance he said would be paid at registration after 15 days . However a month passed by and we did not hear from him or the buyer so we ( Seller) decided not to sell the property. Now when we are returning his cheque of 50,000/- he is claiming more expenses of additional 25,000/- as lawyer fees to draft the agreement and newspaper add of 10,000/- Please tell me what shall I do in this case.