Dishonest Business Practices & Non-Existent Support

Courier lost my package and never bothered to contact me to query the delivery issues, even though I'd used the same address many times before. They falsely marked my package as delivered and attached a **** delivery slip with someone else's details on it as "proof of delivery". I contacted the number of the person who they used on the delivery slip and he had no knowledge of this as he already received his package - so yes, courier knowingly used an old slip photo on my order. I have called over and over (switchboard is bad and goes silent for 30 seconds and cuts you off if busy), i have used the whatsapp bot (it's useless, wow guys, it really is pathetic), I have emailed the support with all my details and information, i have threatened to report, and over and over no one cares and it's been weeks and they are ghosting me to avoid accountability. Customer service is trash. I keep getting told it has been "escalated to the escalations department" LOL. Currently investigating how to report this company officially as this beyond disgusting.