Panasonic — No service provide in warranty period

Sir i buied panasonic ac model[protected]cu-uc18rky3-2/[protected] which is in warranty period but from t day i buied it is not working properly its not giving cooling i made complaint several time on the toll free number they say that within 24 hours they will send an engineer but it habeen since months that no engineer have visited .I think that they are passing the warranty period only. I want to return your product i donot want it as i am so stressed because of it from the day it was installed it is creating trouble i think this is rejected peice .So plz rply soon .