Quikr — Unauthorised use of mobile number/Not deleting account

My phone number : +[protected]
was registered in quikr without my consent and some random mail id was used for login..I had written to quikr support for deletion of my account with ticket no:[protected]
They have revert back saying account deletion is not possible. I am being spammed with hundreds of calls and whatsapp messages about jobs and random strangers from quikr..I wish to change my mobile number with immediate effect from the platform