Poor service Heidleberg mall vodacom

Hi I'm Mrs Pelotshweu Smit I bought a phone at vodacom last year in September then yesterday when I tried to increase volume on the phone then there was this voice that was busy interpretating whatever I touch on the phone then I decided to go to vodacom cause it was not sliding at all so I went to Heidleberg mall vodacom where I found a lady by the name of Doris Makgalemele and I stated my case she was so called with attitude she said when I bought a phone that voice was not there so I have to pay R80.00 and i told her that I don't even know what is that voice for and I will never install something that I don't know on my phone she just said I've installed it and I left then I went to pick&pay centre in Heidleberg an Indian lady assisted me and when I asked her as to what was that for she said it's called talkback and I asked her if she can uninstall it she said she can't because it's in the phone's app and I didn't pay a cent cos she said it was on the phone when I bought it so I can't pay and she told me that she has switched it off I'm writing to you cos I need to report Doris and her attitude towards the clients Please help me My number is *** Thanking you in advance Mrs P.J Smit