3 weeks without service and then gets suspended.....

I have an ADSL contract with Telkom. The line is more off than on, I report it on a daily basis and the problem just don't get solved. The latest problem has been reported three weeks ago, and still it has not been resolved. They want me to pay in full for a service of which I don't get even half of the value I am contractually obliged to get. And if I don't pay my account in full, it gets suspended. When will this problem be permanently solved??????