Defect a/c

Location/place: Dindigul

Name of company/service: Vasant & co

I had purchased one air conditioner whirpool 1.5 ton split A/c from vasant &co retail shop from dindigul but they delivered me defect product I came to know at the time of installation service enginerees came and informed me after calling the shop regarding this issue they are not responding in correct manner please advise.