Insurance on device

On the 1 May 2019 I have upgraded my contract and I have taken insurance on the device for R 115. On the 15 May 2019 a sales consultant from vodacom called me and offered a deal for insurance for my cell phone device for R 59. I have questioned her about the R115 insurance that I have taken in store when doing my upgrade and she has checked on that and told me it is not activated and therefore it is possible for me to take insurance for R59 in which I have agreed to. She also offered me insurance for my modem which I was not interested in. She also stated that the calls are recorded and can be requested when ever I want it. On the 15 June I was charged for insurance on my cell phone of R115 x 2 for may and June plus insurance on the modem of R40 and R 73 for may and June. I have not asked for this and I have called the company on many occasions in which the sales consultant said that they have requested for the voice conversation on the 15 May 2019.i have asked for a reference number for the call and they have not given it to me. My query is that I am paying for stuff that I have not requested for and I am not getting any help with this query.