A company that sells phone lines but cant answer them

Both my husband and I have app**** for an Uncapped broadband wireless LTE special that Telkom is running online. At first I was told on a Friday I would be contacted in the coming week, during work hours, and on that next Monday I received an email saying they couldn't reach me I must phone them . . . funny. So I phoned, held on for 20 minutes only to be told I cant speak to anyone, they must phone me. Unfortunately my husband works underground and missed their calls the next day. He had a voice mail with a number to phone them back - probably to be told he cant talk to anyone they will phone him back - however I have phoned back on two occasions. 1st - on hold for 35 minutes, I gave up, 2nd time - on hold for 47 minutes with no answer so I gave up as I have a job to do. How are we supposed to communicate with Telkom, the telecommunications company?