Losing/*****ing parcels

I shipped a parcel on 03/03/2022. Parcel was "accidentally" marked as delivered on 08/03/2022, whereafter it disappeared. After numerous floor checks throughout March, it was declared lost on 29 March. To date, 05/05/2022, the claim for lost parcel has not been processed, with continuous excuses being offered, such as the employee responsible for the mistake does not work at the company any more. I will never use this shipping company again and definitely will not advise anyone else using them.