Vodacom pathetic customer service

Experiencing serious bad pathetic service from Vodacom online. On the 16th of December 2018 i upgraded my Vodacom cellphone contract which i opted to do online as they advertised a i phone 6 and getting a free pair of Beat by Drè if done online. The cellphone was delivered by courier a week later but still awaiting delivery of headphones and it's almost May. I've contacted Vodacom online via email, i was promised that it's in hand and will be delivered soon, this was since January as i was told in December that the online department all went on leave for the holidays (can you believe this?). I even threatened to stop the debit order to get their attention but this also didn't help. At one stage they promised me 3 weeks as they did a manual despatch, still waiting. This to me is actually misleading the public to make sales by advertising specials but either don't have stock or don't have it at all. I'm thinking of reporting them to the Ombudsman for false advertising just want to get more information on how to do it. Vodacom online, your service is pathetic and customer service needs a serious upgrade.