VODACOM

On the 28th October my husband cancelled his Top Up vodacom contract which is on my vodacom contract which they did without a problem. Today the 26th November I phone just to check if everything was in order and the contract will be cancelled end of November. No problem. I then noticed my vodacom modem which contract expires end of December 2015 had been upgraded. So I called vodacom customer care and they said that I agreed to the upgrade, which I never did. They said that they will listen to the recording and that will take 24hours. I asked if I could also listen to the recording, no problem, they will forward the recordings to the nearest vodacom outlet. I explained to the cancellation department why would I upgrade my contracts if I am busy down grading and cancelling contracts as it is becoming to expensive. I requested the Complaints Departments telephone number and they gave me the Insurance Departments number, how convenient!!! Please can you assist.