Vodacom Call Centre Complaint

I'm very unsatified on recent Vodacom Call Centre Call received on 27/03/2018 from number ********** 444 time 15:49. The lady asked me about my wifi device and if I wanted to upgrade it. I advised her I cannot speak now, I'm at work. She asked me what time will be more convenient to call me back and I rep**** I don't know that I'm currently very busy. She confirmed that the call is being recorded and to confirm that we had the conversation, she asked me to confirm to her my date of birth. The next day I received SMS's that my contract has been upgraded. I contact the 082111 Vodacom Centre as on 28/03/2018 and spoke and communicated to Unathi at 09:50 about this upgrade, which I did not asked for at all. She could not pick up who the lady was that called me on 27/03/2018. She advised me that I needed to get an Affidavit from the police station stating I did not asked for the upgrade and forward documents to ********** which is not my fault at all. Firstly I did not ask to be upgraded and now I have to run around and get all sorts of documents to get contract cancelled. I want this contract cancelled with immediate effect otherwise I will have to take further steps and contact the Ombudsman. This is very upsetting to me and my husband was very furious of the matter.