Theft of items and Passing the buck!

I am a client of Dawn Wing's and used their services to courier my products to clients. On the 14th December 2015, Dawn Wing collected my items to be sent out to clients and 1 parcel was ****** and never arrived at the client. The parcel was 2 handbags to the value of R1090.00. Not only did i have a very unhappy client as her purchased items never arrived, I had to refund the client from my own pocket as I still await the refund of my ****** products from Dawn Wing. To date, I have as requested, my letterhead, banking details and been promised it would be sorted out and they would get to the bottom of who stole my products. I am still waiting for the refund and some answers as to how my handbags got ****** in the first place when the box was sealed with the fly-bag on top??? They surely have a record of who collected the items and where the items went before being dispatched and nothing has been done. I am very disgruntled to say the least!!! It has been a bad reflection on my business and I am financially out of pocket due to them!! I would have saved a lot of frustration and embarrassment by just delivering the items myself to my client ! The consultant has just passed the buck!