Short payment on outbonus

Currently the service received from Outsurance is very poor. I have called many times and in each instance I have had a different person give me their name and said that they would call me back. They havent. When I call to speak to the person who said they would call back e.g Shaleen,Amoray,Laura,Kaya her supervisor Shaheep no one knows who the people are. My outbonus has been short paid and that is the issue I am trying to resolve. They will not give me the help or assistance I need. I received a letter stating they would pay me a certain amount and then a few days later informed me via sms that I would only be paid a lesser amount. This has to be resolved now.