MTN is committing *****

They said if you subscribe to their 35 mbps line, you get a R1000 Makro voucher. Which now after I subscribed I'm informed I didn't qualify for. After I asked the consultant how does the voucher work, she said as soon as my home internet line is active, I'll receive a message with my voucher number. This is false advertising. MTN as a company is really busy with ***** only to get you to sign up. Also you have to pay for 2 months in advance and then pay again after 30 days. How?