you have retured the money by cheque so there is bank transaction and thats the proof that you have returned the money. fo rthe cash payment , do you have any receipt or any other document that suggest the same or have you withdrawn that amount from bank in csh to return to your father as that can also be a proof . for further clariffication you can contact me further
Does your father have evidence of him giving you cash? Do you have any messages or any other evidence to suggest the way you were going to pay him? For the repayment you made by cheque, you can use the bank encashment records (basically, your bank statement) to prove that you repaid. Ultimately, this will depend on the evidence you might have otherwise, and the evidence your father has.
Book a phone consultation with a top-rated lawyer on Lawfarm.