unsatisfactory poor client service

Vodacom sell me a additional telephonically contract for a VI 64k DUO RP device. The device was delivered on the 30/11/2015. On the 2/11/2015 I phoned vodacom and cancelled the contract.The device was collected on the 17 - 19 November 2015. Not sure of date. On 29 December 2015 I realise that they still deduct the additional contract. On Sunday 3rd Jan 2016 I went a to Vodacom shop were it was stated they can not assistance me and I must phone ***. So I did phone what poor service. According Masha the team leader their is no notes that I phone to cancel the contract, also they did not collect the device. Basically indicate I am lying.