The Professional Couriers — non delivery of article

I have booked an article from surat to chilakaluripeta on 22.02.2018. But it was not received by my customer yet. My customer also approached the branch but they are not responding. I also have called to regional office but instead of listening to my complaint, they are giving the contact numbers of the branch. The branch personnel are not at all responding. My consigment number is "srt[protected]"