HTC — Network Issue, Speaker & Mike not working

Address:

Mumbai City, Maharashtra

I have purchase HTC-Desire 820 on 19th april 2015 & it started giving problem of network in the month of July, had to submit the phone for repair and received after 20 days ... after using for few days again it started giving problem this time speaker & mike are not working...I don't know what to do with HTC. They have only collection points in metro cities as well & worst part is that service center people are bluntly saying that "IF HTC PHONES WILL WORK PROPERLY THAT WHAT IS THE USE OF SERVICE CENTER & HOW HE WILL EARN"...even customer care people are of no use they are giving only 1 solution that is "SUBMIT THE PHONE" that' s it... NEVER EVER BUY A HTC PHONE.. WORST SERVICE EVER GIVEN...NEITHER THEY ARE REFUNDING THE AMOUNT NOR THEY ARE READY FOR THE REPLACEMENT WORST COMPANY EVER I EXPERIENCED