"Ma'm you are not our only client" Disgrace to any honest business

After spending HOURS on the phone with the Fedex customer service agents, my package was scheduled to be delivered on the 28th of July. I have attempted to contact the import agents assigned to my case, atleast 10 times on a daily basis, not getting hold of any of them even once. I have sent my querries to the floor managers and team leaders , guess what NO response. Each call agent just as pathetic as the next, being told that I am not the only client and that the customs agents will get back to me when its my turn. How long must we wait for feedback ? How long does it take one of the supposed leaders to answer my questions? Clearly everyone is on holiday! How hard is it to get any concrete and valid feedback on the parcel ? Being told one thing by one call centre agent only to be sent an half ass email from the pathetic custom agent after more that 5 days of emails sent to him.

WHAT DO I NEED TO DO TO GET ANYONE TO GIVE ME ANSWERS ON WHERE MY PACKAGE IS, WHEN IT WILL BE DELIVERED?

Dont get your hopes up when one of the call agents tells you that they will call you back with information. That never happens!