How to rebut presumption u/s 139 NI Act?

Hi Experts, Please tell me How we can rebut presumption u/s 139 of NI Act. A friendly loan was given by the complainant to accused of a Huge Amount of Rs. 14 lacs and that too in cash. No Document was executed as to loan Transaction. However, complainant has showed that he arranged Rs. 14 lacs by selling his agricultural produce and taking loan from his wife. A sale deed executed by his wife in 2007 worth rs. 13 lacs is on record. But complainant gave cash loan of 14 lacs to accused in 2011 without executing any document. Please guide me, How to rebut the presumption u/s 139 NI Act?