business cash sale

I have my wholesale grocery business in which I make sales in credit for 2 months and get cash payments against that credit and I transfer all my payments through bank curent account to people from whom I purchase gramdall and gram all items in bulk.. so my question is what effect will be there after 500 and 1000 notes bann. how will I prove to department .. I make memos of cash sale of any party name in my books