Unfair upgrade

Hi.<br> I recently upgraded my vodacom Flexi 110 contract to a Flexi 200 in which I chose the Iphone 5s as my device.That evening I got the device I left it to charge, that morning upon switching the device on I noticed a pink stain on the screen. I notified the outlet where I got the phone and was told to bring in the phone for repairs or replacement. I had the phone for a total of 3 days. After 5 weeks I was notified that the phone has been discontinued and that I should come to the store to pick a new phone. They gave me the option of choosing between a samsung 5A or Sony C3. The only reason I upgraded was to get an Iphone so these two options where not what I wanted. I asked the manager if I had another option for an Iphone. He said that I could get the Iphone 6 but would have to pay the difference that would amount to almost R5000. I then asked if I could change my contract option so that I could get the Iphone 6 but was denied. I asked if I could end the contract as I have not yet used the upgrade nor have I started paying the new installment which is due only in November. Yet again denied. I am now bul**** into having I phone I do not want and an extended contract.