DTDC Courier & Cargo — Package not delivered but says delivered

My package with tracking number X76398678 says was delivered on 3rd but I haven’t received the package or even a call from DTDC regarding the attempt to deliver. I’ve been trying to get a resolution from them since 3rd and all I get for answer is that they are trying and will call back within 24hrs.
I’ve spoken to 4 different individuals through their customer helpline, and it’s the same response every time. And I haven’t got a call back from a single one.
The package is worth upwards of 10k and has personal belongings of emotional value. Do get this resolved ASAP
Very dissatisfied with the service
Wouldn’t recommend or ever use your services again