Drivers and the service delivery

I actually am so flabbergasted by the way this company works and treats their costumers. I guess after taking the money they really don't care about you. I receive my chronic medication monthly via the Discovery medical aid. With them. Every time they have to deliver the driver comes hoots the car and then not even 5 minutes just leaves without waiting for 5 minutes. They don't even call to find out if you're at home. They expect someone to always be constantly waiting on them without prior arrangement if they are coming. You ask the lady over the phone she tells you that she doesn't know when they are going to deliver. I have time and time again spoken to them to call before coming. Clearly that has fallen in purposely concealed and sealed ears. Then when you call they tell you that they tried to call. And request if they can update the system with your numbers. Now how many times must this be done? Seemingly the drivers who deliver are serious ***** and their system obviously flawed to be updating every month. Now it's 3 months without treatment. And this back and forth calling and the drivers not delivering. Honestly this is the worst service delivery I've had. worse if paying.