Sold me a phone contract falsely

I received a call from someone at Vodacom, telling me that I won a Samsung pocket neo, a R300 Homemark voucher and a R150 cellphone contract for 2 years. They asked me to confirm my details and asked to what address they can deliver. I received my package with everything inside like they told me, but when I went to a vodacom shop near me to activate the sim card they told me it's a contract sold to me falsely and I only have 14 to get them to return everything. I went through a lot of trouble and I'm waiting to see if they will come get it within 7 days otherwise I'm going to put in a police complaint. Beware!