Query-income tax

Dear Expert, One of my client doing business as Chemist Shop and his total gross sale around 20 Lakh  and Interest recvd under section 94a from banks around 1.50 Lakh. Question are: - 1. Can I fille return under section 44ad for both . 2. Bank deduct TDS 46k in F.y 2016-17, 42k in 2015-16, 36k in 2014-15, 26k in 2013-14 & 15 K in 2012-13. my client filling ITR 1st time Can I refund my TDS for all years or how to refund? Thanks Anu Verma