Addition made u/s.69A- unexplained money- during demonitization period - cash deposits

Sir. during the assessment proceedings, certain amount is added u/s.69A which belongs to the cash deposits during the demonitisation period - assessment year 2017-2018 . Penality notice was also issued U/s. 271CCA(1).
sir. any case law's which will help me for waivor of penalty.