Online sales application malfunction

I have been trying for more than 2 weeks to make an online application for the Unlimited Wireless Broadband at R599pm for which I received a promotional email from Telkom. So I submit an online application and it continues to tell me that my request cannot be processed now. Please try later. So this is ongoing. I try to call the sales department, the number remains engaged. When I speak to an online chat agent, I am told that if none of these work, the only solution is to find a Telkom outlet and make an application there. I fail to understand the logic. Surely if you have an online facility it should work? If it does not work, do not advertise it. So what am I to do? Find a different supplier?