Direct person to person .. What additional jnformation would be useful ?

I sent an important parcel through Evri on 28th November which never reached its destination. It was sent on the next day service ,tracked ,signed for and insured .. I have not been able to get any sense from any angle as regards claiming compensation or preferably recovering the parcel the contents of which are irreplaceable.. I went to the depot near where the parcel was going and they wouldnt help but took my email address to send me a claim form .. This they never did ! .. In February the tracking eventually came up with that it was picked up from my designated pick up point .. There never was a designated pick up point and neither did I pick it up .. The whole thing has been an absolute farce ! Fuming about this and the annoyance and inconvenience is absolute not to mention the expense and sheer disappointment of loosing irreplaceable goods of considerable financial and sentimental value.. I really don't know what to do next.. Tracking number is ***** I have the receipt and also screenshots of the tracking stages .. What can I do to claim ?