Cancellation of contract

On the 24/12/017 went to vodacom at Eastgate, I took a contract phone hauwai p8lite, for R129.00 pm, I saw a better deal with Telkom then I returned the phone on the 26/12/2017,the consultant called the supervisor she then talk me that I can't return the phone, when I asked why she told me that the contract that I signed for its stipulate that, when I ask for the terms and conditions for contract cancellation she couldn't show me or print me one, she keep on telling me about the 7 day return when the phone is faulty,of which that are the two different things,cancallation of contract and fault of the phone,since the consultant and supervisor were unable to show me the conditions of cancellation of contract, it was clear to me that they don't know what they are doing ,cause clearly it must stipulate on the contract and as a result I was never given my contract to go through it,i left the phone at shop, not a good service at all if a customer cannot be Shawn the term and conditions they tell you that that's what you signed for.