Lifestyle - Didnt get REFUND amount

I had orderd on *-*-**** puma slippers through lifestyle app and i returned too and its over many days ago only i returned may b its already over **days ago.i actually logged in through facebook and now they are telling as we had sent a voucher code to that your registered mail I'd,but i said them that is not my registered mail I'd, that is my Facebook I'd and i mailed them to by my own mail I'd as please send the refund details to this mail but al ready they told as your ticket is closed so for this reason im filing case on lifestyle because still also they are not giving me any response...