Misleading and bad customer service

I am just not getting any joy from Vodacom, they overcharge my account hence I called in to terminate my contract with them. I received a call from one of the consultants offering me a combo deal which was quite appealing, so I considered the it since I was due for an upgrade. After I confirmed the combo deal for (Huawei P20 & Huawei Psmart) I received my delivery on 22 May 2018 and to my surprise the box was not sealed and when I opened to see the contents, that's when I realized they had delivered a used phone, I tried numerous occasions to get them to collect the phones from my house and the guys kept on telling me that they would return my call which never happened. This is a time consuming issue that requires time and money, I have to constantly make calls to the contact center where there's no one who understands my frustration. I feel this issue should be dealt with and I need someone to sort it out ASAP.