At the moment ISP's like WebAfrica and CyberSmart offer what is called "All Inclusive" ADSL Packages. That includes the ADSL Installation and Bandwidth charges all in 1 price. They are basically reselling Telkom's services. 

What's happening is that, if you order through e.g. WebAfrica they deny your order. Then if you order through Telkom's ISP "TelkomInternet" then your order gets approved. You can wait anywhere between 1 day to a 3 weeks before you realize your order has been denied when going through an ISP.

In short don't order through the ISP there is major potential that you'll end up waiting longer for your ADSL. Don't get me wrong here. I love the local ISP's. I use WebAfrica myself. I would rather die a 1000 deaths then have to deal with telkom.

http://mybroadband.co.za/news/ADSL/1418.html

The above article explains it all. Telkom is basically just being full of shit as they always are!

My suggestion would be to order your line through Telkom and then switch ISP's after 1 month of usage with Telkom. ISP's give you better service and they don't steal your cap!

Yes Telkom are known for stealing your cap. I've caught them out on numerous occasions.

Good Luck