Objection to cancelled "agreement to sale"

I have done agreement to sale with my friend (all stamp duty & registration paid by me). After one year he told me that he will refund my money and will not sale his property. we did cancellation of "agreement to sale deed" without mention any reason to cancellation and without mention details of any refund amount given by him to me. after that as committed by him I have not received my refunded money as well as now he is telling me he will not pay me any amount also not give property. what legal action shall I take, can I take objection that I have not received any amount against this cancellation of deed. or can I cancel this cancellation stating no amount received against cancellation. or shall I convert this "agreement to sale deed" to sale deed with POA (I have POA supplementary to agreement to sale).even if I cancelled this agreement.