MoMo is a NoNo

I received an email on September 14 "It's simple with MoMo. Log in to your MTN MoMo App, purchase any Data or Voice deal and get your R500 worth of Guaranteed Grocery Coupons redeemable at any Checkers & Shoprite store." So I did. Nothing happened. I emailed MTN Momo on the same day. On September 17 I was asked to provide information like 'your Momo balance' & 'home address' - not sure what this has to do with anything, but I rep****. On October 1 I received "...SMS Momo to 30172 and a Consultant will call you back and add your number on the database" I did. October 12 (after sending multiple SMSs) I sent another email. Nothing. October 18 I received a reference number October 25 I sent another email. I received a reply 'complete' - nothing else just the word 'complete'