St Courier — document not delivered

Address:

600116

I asked indane gas agency to courier the transfer certificate since there were some printer problem when i visited personally. Unfortunately they sent the document through st courier service. When i checked the tracking details online, it was shown as misroute. I called the customer service and enquired.. After 4-5 days of continuous calls they said that the document was received at guindy office from porur but they lost the document. They said that they searched their office and it's not available..

Worst service. Let me know how to proceed. As i checked other complaints there's no response from stcourier..