been charged for unknown device

I have been having a laptop contract deal with the provider on its 22nd month decided to upgrade and take a Sony mobile phone to my , since I have advised that the new device will be billed together with the laptop deal until the laptop deal expires to my surprise I am still been charged for the laptop which the contract should have lapsed already and additional two mobile devices while I ordered and received one, yesterday 25/02/2015 I called the customer service spoke to Zuki call ***, who confirmed that i been charged for two phones since the upgrade, but could not help me further as it was done by the other department which is Upgrades and as such the billing department acts as per information provided by the upgrades. To my shock my customer rights are been violated I cant dispute the wrong billing but was referred to upgrades department which the lines hard a technical problems according to the voice prompts, So I take it that Vodacom does not have a dispute department nor a process to be followed in such cases. I need this matter resolved asap i am not going to pay for the service or devices that I am not provided for .