HTC — Defect in instrument (on warranty) submitted on 09.01.2016

Address:

Khordha, Odisha, 751006

On 09.01.2016, I have submitted my device (Model Desire 326G dual sim) with IMEI No. [protected]. The device was not getting charged and microphone has developed some snag. It was assured that within 7 to 10 days the repair will be made.
On 25.01.2016 there was a call from +91 [protected] informing me that the matter has been escalated and I will hear within 48 hours. But till now i.e. 27.01.2016, even after nearly 20 days the position of the device could not be ascertained.
On contacting customer care[protected], I am not in a position to get any satisfactory answer.
Is there any one to look after the problem and tell me the correct picture.