Misplaced delivery

I recently ordered some items online and the company I ordered from used FedEx for delivery. Day of delivery I got a notification stating that my items are delivered only to find out that they were handed over to someone I do not know nor did I consent, I had not received any communication apart from the navigation status with regards to the items being delivered, not even a phone call. I contacted them, after a couple of attempts it finally got through to the an agent who helped me open and investigation into navigating my delivery. I was told that I would get a response in 2 days and now it’s been 6 days and there has not been any update. It’s disappointing for such a big company. Right now I am paying for items that I did not even get, lost items.