Paying for service not received

<p>Since November 2016 I have been struggling with Vodacom, I did an upgrade and then when I followed up they said it was never done due the system problems, I instructed Vodacom to then not upgrade, this instruction was ignored and the upgrade was done. Since then I have been phoning to follow up on what is happening, in the last week of December 2016 I was told that they would look at the matter and get back to me, I followed up in the first week of January 2017 and they again said they would look into it and get back within 2 - 3 days, it has been a week, I want this sorted out immediately. It's easy for Vodacom to take money but seems it is difficult for them to deliver the service required.</p>