New Telkom line just not working - it did work for 2 week. Confused

I changed to a phone with a sim card. Told the Telkom people at Rosebank (who were very helpful) that I wanted to pay the R200 a month - no DSL but now the phone is not working. I don't have time to go back to telkom in Rosebank to ask why it isn't set up - it did work for the first couple of weeks.