HTC — about my htc desire 816 dual sim phone

Address:

Jehanabad, Bihar

i give my phone to htc collection point patna[protected] .and the htc collection point told me that your is repair in 15 days and we will give you your phone after 15 days .but 1 month still ago i cannot received my phone .when i call to the htc company toll free contact no but there is no a confirm information is given by the company and i regularly call to the htc company toll free contact number after 5th april but the company not give me a correct information about my phone .and the customer care executive talk to me loudly and say me to talk to your service centre to know your phone status .and the htc coolection point in patna is cannot receive my phone and and he not hear my complain .