Companys incompetence on lost parcel

Its over a month now waiting for feedback from the Courier guy.I was supposed to receive my parcel on the 28th July it was not delivered, the company never even bothered to call to inform us that their truck has been highjacked, I only found out on the 30th when I called their offices ,before then they took me back and forth from one consultant to the other ,one said its back at their warehouse the other said its out for delivery till the last one finalized by saying it's been highjacked. I am very disssapointed with their service because since then I as the receiver and my sender have sent through complaints and submitted their claims form for our goods but till today we haven't heard anything from them. I tried calling them last week to find out wats delaying the process ,instead they want to direct my calls to their insurance company that shows high level of incompetence and distortion.Can I please get assistance regarding this matter I trusted this company with my money and now I need a way forward, my parcel was worth a lot of money that I can't just afford to lose My parcel number TCG***6