Micromax — dead mobile phone

Address:

Gaya, Bihar

I bought a canvas a74 on 25/1/14 which got dead on 28/10/14 i went to the service center and tried to repair it, when i went there on 19/11/14 they said its dead, u have to leave it for 3 month then i again resumited it on 21/11/14 after 4 month they are giving me Mmx bling a84 model without battery. And asking me to order the battery seprate, bling is a outdated model and even dont comes with same spex, tell me what to do or to go ahed.