Nokia India — nokia 3310 blank screen

Address:

New Delhi, Delhi, 110006

My nokia mobile phone's screen got blanked more than a month ago. I visited nokia care to got it repaired they advised me to call hmd as my phone is still in warranty period. I have first contacted hmd nokia customer service on 9th september 2019 and the representative assured me that they have arranged a pick up for my device. However, it's been more than a month now.in spite of multiple calls and assistance from nokia representatives my device has not been picked up. Is there any complaint escalation matrix.