Worst service ever!

I've been fighting with telkom for 3 weeks to get a damn line sorted for our home. When I eventually got through to an agent last week she put my ****** address in wrong. My appointment was supposed to be Friday 2 October but it changed when I changed my address. This morning I got an sms regarding my installation for Wednesday and the address is still ****** wrong! Now I get told they will check availability. I don't give a continental **** about availability. Your staff stuffed it up and now you will install on Wednesday at 7:30. I'm sick to death of telkom excuses and bull **** lies. I want a manager or supervisor to contact me regarding this as clearly the staff at telkom don't care about customer service!