HTC — Worst customer service I have ever encountered !!!

Address:

Thane, Maharashtra

I had visited the hTC service center at Thane, Maharashtra on 8-th August, 2015 to repair my hTC Desire 501 mobile, having display issue(service ticket no-15INA[protected]. There, I was charged Rs-230/- for diagnosis and assured that within 10 days the service center would provide me the quotation details. But till today, I did not receive the quotation and not even a single Phone call from hTC associates.I had dropped query mail three times to [email][protected]@htc.com[/email] but every time got a pre-formated unprofessional reply that the phone is still on diagnosis. On this circumstance please advice what should be my course of action. I will also advice people to think twice before buying a hTC device.