Coolpad India — delay in providing service

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I am basant shishodia i have submitted my handset in immortal service centre kalka garhi chock ghaziabad on 18 september 2017 for repairing a little charging problem, backup, and heating problem. Service centre told me they return my handset on 3 october 2017. But they did not return my phone is coolpad company and model = 3600i-100 grey - cp3600i-100 coolpad note 5 grey. My jobsheet no. = js[protected] and my handset imei no. = [protected]. I purchase this phone in 17 june 2017. My phone is in warrenty 1 year