Issue regarding fake payment receipt

One has done complaint against me for Payment delay for two months and submitting him non-registered company receipt by whatsapp. We are in car dealing business which sometimes profit are in much higher side. I am submitting him with all details with profit expexted as i received his payment for each car deals. From 22 March To 13 April business is on time. I had given profit up to one lac but after my father health condition issue rises and in few days he expired due to heart attack. And i uses his amount in father hospital expenses and some amount in Loan payment. After 15 days he demand me for profit but no show then he start demanding his whole amount. I request him to give few days to repay but his wife and he started severe harrasement and later he went to police station. During his harrasement period and in afraid condition i had delivered him cheques include high profit amount. Now he has proof of my unregistered company payment details receipt and my cheques.