Vodacom upgraded me to the incorrect contract!!!!

I upgraded my data line during December. The contract activated today. I upgraded to the 3GB Top-Up, but when I looked online today, it shows that I am not on a top-up contract and that the line is open. I have phoned the call center 4 times now and used the online chat. They keep telling me to phone the online department and the online department tells me to phone the upgrade department. I don't want to send the device back or cancel the contract I just want the contract migrated to the package I upgraded to which was a 24 month 3GB TOP-UP!!! I do not want an open line!!! FIX this now Vodacom! Your call center is absolutely useless. No one can assist me and they tell I am out of the 14 day returns period! I DO NOT WANT TO RETURN! I want it to be changed the contract I chose when I upgraded. And how am I supposed to know which contract I am on when it only activated today and became visible to me online? This is a whole month after I upgraded and the device was delivered so how could I have known within 14 days?? Your service is terrible Vodacom! Please fix my line today!