Vodacom Billing issue

I have been trying to sort out my billing issue from December 2018. I was charged for 2 devices that was never given to me on 2 of my accounts. i queried same in December and it "apparently" resolved. In January Vodacom debited my accounts with more than double my monthly premium. I spoke to a certain lady by the name of Thembi from accounts who when asked to break down my account to establish how am i being billed cut the call. I then called back and spoke to Mpho as well as a manager by the name of Nick. Nick confirmed that indeed i have been overcharged and he will sort the issue out. This morning i received a sms stating that my account has been resolved of which is not. Can someone from the billing department please sort this out.