CELL PHONE UPGRADE

I upgraded my cell phone and as not advised that the phone that Im taking is going t require a nano sim card, I didn't thin it would be a problem so I thought ill just go to a store and buy a sim card and have a sim swap done. I had no idea that there are different types of sim ( contact and pre-paid). When I called vodacom the put me from one person to another, telling me its not our department let me put you through to someone else. The lat person I spoke to said she will get this sorted and the right department will call me. To date I still did not receive a call from them. Im very annoyed with the service I received