Cheque bounce case effects-reg

Hello Sir, I had taken a loan of 50000 from a friend relative. for the same i had signed a promissory note and gave a cheque. As per the term it was decided for 3/-rs interest ie 1500 pm and 5000 principle paid to be together every month comprising of total 6500pm. i had paid the same to my friend for last 9 months and 1 months balance is due. For last 9 months i haven"t receive any call from lender. Know when i went to lender to pay last installment, he is refusing to take the installment and return my notes. i asked why in return he said that he haven"t receive any paisa till date. i said that i had paid the amount to the so called friend and further said that he had collected the instalments on behalf of your name and previously you had said that i can pay in cash to that person. the lender is talking in reverse mode that i do not have any link with that man and i want my money back. I further said that two of my known persons had taken loan from you and the same person is collecting instalments from them till now, then how could you reject the acceptance of my money which is collected by that person. he said, i will call him (my friend) and ask about the matter in ignorance and later day both of them were on talking in their house. now the second person ie my so called friend is making reverse drama of not taking of any money from me. And further both of them are advocate and they are blackmailing me of filling of U/S 138 NI Act. Sir i have call records of both of their previous negotiations in which they accepted the taken amount and pending one instalment is due. Know i want to know how could i face the situation and further i had given the instruction of STOP PAYMENT of Cheque when presented for clearance. please give the needy information.....