Not fulfilling the CPA

On Sunday the 3rd I went to vodacom Northgate to upgrade my contract and I saw the LG G4 stylus, so while upgrading I asked the agent if the stylus was better then the LG G4 and the agent said it was but they don't have stock. So we phoned around and found one at the Melville branch, so I went to Melville and opened the contract. During the week I received a phone call from a vodacom consultant asking if I was enjoying the phone and I stated that I was not. She then advised me to go back to the store and they will swop it out and I would only have to pay more if the device I got was more expensive. <br> <br> Now on Sunday the 10th I went to the store to swop it and was told they have never heard of this, so I phoned 111 whiles the consultant was listening and I spoke to a agent on the phone asking if I could swop the phone out and they said yes. The consultant then spoke to the agent and they landed up having a fight on my phone. I then went to another vodacom (I will not mention) and they told me that it is possible and that Melville is not holding up to the CPA and I should take the documentation to them. I am now sick and tired of driving around so I hope this process will help