Lost luggage in Greyhound bus

I am so disappointed with how my case is handled, there is no feedback or whatsoever. I lost my luggage in the greyhound bus as someone took mine and left theirs. I booked the premium greyhound and on the 16th of July 2022, I have been calling different numbers for help, but there is nothing being done. The greyhound workers are not doing their jobs because they do not check the luggage sticker when giving you your luggage. Some people are given luggage stickers and some are not. It’s been days without getting a call or anything on what can be done. I arrived at park station Johannesburg and they referred me to the Eldo Coaches office but I got no help. This is unacceptable. Greyhound is definitely low class now.