Worst customer service from Vodacom

I've been waiting for my vouchers since the 17th of April. Been calling calling the contact center for the past 3 months, with no joy. I called again today, only to get through to one of the most rudest agent by the name of Raymond from the Vodabucks department. Guess what, he also could not assist an proceeded to drop my call when I asked to speak to a team leader. I called again and again without a fail to dropped my call again. No reference number.... Nothing. Like all I want is my Nando's vouchers I purchased on the Vodabucks app.