Unwilling to help

My parcel was out for delivery on 30 May. When I followed up directly with skynet couriers they informed me that my parcel was in one of their vehicles that was hi-jacked but they they will not provide more info to me and that they will inform the sender. I have send numerous emails to Buffalo International logistics in the last 4 weeks and they are unwillingbto read my emails. All they do is they keep sending a link to track my parcel. The number provided on the link is a number that don't exist.