cancelling service i depend on

The telephone line that provides the area with telephone services, has been damaged. I contacted telkom and reported it as i depend on the line for internet since i work from home. They got back to me after 15 days and informed me that they will not be fixing the line. This however is unacceptable since i depend on internet to earn an income. Telkom then offered me a wireless option that i cannot use since it excludes an unlimited data package which i am extremely dependent on. After explaining this to a service operator she informed me that they will be cancelling my telkoms services if i do not take the offer. This is not the first time this has happened and i am extremely upset about the standard of service and response to my problem. I am a paying customer who depends on the telephone line for internet and have been disappointed over and over again by telkom.