Hindustan Unilever Pure It — Classic 23 litre purifire

I have purchase at 20/3/2016. there is 6 month warranty in this product but even 3 months after purifire isn't working. i have complain two times in hindustan unilever pure it company in the number [protected] my complain noted and told by them that mechanic will come within 2 days. mechanic also call me two time but he will not come and make complain close. i call again to customer care but there isn't positive response. please help me. my complain number in hindustan unilever is c[protected].