NBo response , nop assistance and delayed parcel

I have been waiting for my parcel , its been a week now when I called the speed-services courier the agents responded and transferred to where there was no response. I've been calling the call centre for several times for assistance but I have not been assisted till now. their service sucks. I have not been assisted , I am still waiting for my parcel of overnight parcel. The parcel was posted on the 18th of May 2015 but I am still waiting for it .