Vodacom has lost the essence of customer service!

In response to my previous complaint i rep**** & no one has responded hence the new complaint. I received my new devices however ever since the complaint was logged nobody from Vodacom has even called to acknowledge the complaint. I've ordered two new upgrade devices & part of the deal included accessory vouchers for both devices I haven't seen anything in the packaging. please advise where & how I can redeem this to request information from your call centers is a hassle.