Lost a denim jacket at Legacy Yard uMhlanga at the Corona Fest still waiting to get it back!!!

I attended the Corona Festival on the 2nd of October 2021, which was held at the Legacy Yard - Backyard Roof top at uMhlanga. I forgot my denim jacket at the event and have since been trying to get it back from the staff members who confirmed that they have seen it. I made arrangements to fetch it last Tuesday, but I was unable to get there due to work. Apparently a lady by the name Thuli confirmed that she saw the jacket. I drove there on Thursday last week, and they have been giving me the run around. I'm truly disappointed as I thought the venue was safe and I could retrieve my lost goods. I'm really unhappy about the service and the fact that noone is willing to show me cctv footage and help.