Parcel is 3 months overdue, zero support

I ordered a Thinkpad mouse on 2020-12-03 which has still not arrived (2021-03-05). I've followed up multiple times and been told via email support either that MyUS is experiencing delays (not true, I use them frequently), or that Fedex is holding up the parcel (my MyUS parcels come in with Fedex and they are prompt). Response to tickets is extremely slow, and the company adds no value whatsoever and takes forever to deliver - I can order via MyUS myself and I don't have to pay their margin and wait for them to process the order at a snail's pace. Absolutely useless. I've now threatened them with a ***** charge - I'm not surprised they can't be phoned.