LG Electronics — air conditioner complaint

I was unfortunate to order an lg airconditioner with model no lg js-q 18wtxd (1.5 tr split ac) at t v house alleppey kerala. It was verbally ordered. After one week, the shop owners supplied me an a. C. With no js-q 18 ruxa about three days back. The shop owner had collected the installation charges and the two boys sent by them had installed the a. C.. Ever since installation, i cannot use it as when put on, it makes cracker like sounds, also while put off.
My first complaint is that i didn't get the actual product i had ordered.
Second is that though the ordered one was not supplied, the supplied one is scary as it works as if crackers while on and off position.
Kindly get my grievance redressed by replacing the ac js-q18ruxa with js-q18wtxd.
An early action is solicited.