Poor service and false advertising

I completed a goal to buy data from R30 or more and get 20 vodabucks. I didn’t get them. I called in 29 August spoke to Abrina who said she cannot see on her side that i bought the 2gb for R49 on just for you and she said she will log a call and call me back. I’m still waiting there’s no feedback i tried calling Vodacom but keep getting cut off