Flipkart — wrong item received

I ordered a lloyd 1.5 tone inverter ac from flipkart and when it was delivered they said not to open the box they said our technician will visit to install your ac only he can open the box... Then next day when lloyd technician visited to install the ac at my home he unboxed the ac infornt of me... Then we find that the indoor unit of ac is old &used and also it was not of lloyd brand it was other brand the technical said to file the return as recived different product recived he also complaint form his side to return or replace the ac unit... But when we registered the complaints in flipkart customer care they refused to refund or return or replacement.. And they are rejecting my request again and again (4 time they reject my return) for refund or replace... And they are not doing any solution of my problem... The unit image which we get (Old & used & other brand) and invoice copy is attached below... Thank you i requested you to help me in solving my problem as soon as possible