Disgusting service from Fidelity ADT security N1 city Cape Town

So I have resigned from Fidelity ADT security N1 city the first week in August 2024. I was informed by HR that I’m still employed. Today is 19th September 24 and their excuse is system errors. This is the type of service you will receive from this company I was one of the team leaders and it’s just shocking to see this type of work ethic. They could not give me a proper answer nor a reference for this.