vodacom **** service,just want to make money dont

On the 10th of October 2015 I went to vodacom waterfront to cancel my insurance on my on device and reactivate a new insurance for my current device I recently bought.I filled in papers and signed.the following month I saw on my statement that I'm still paying for the same device and not the new one...which of cause ****st me off.I called vodacom insurance the asked me to please redo this because they haven't received papers about a new insurance.On the 25th of November 2015 I went to the canal walk store (vodacom )and did the same proses,I even took a photo of the paper work which I signed...guess what yesterday the 1st of December 2015 I went to vodacom in parow too check if it has been updated and still nothing has been done..they asked me again to redo this.so I'm asking *** is going on is this the type of service u get...and they have been deducting and not correcting my account this is not on.