FNB CONEXIS X2 SIM UNLOCK CODE - BAD SERVICE FNB

Good Day , I recently bought a new device from my bank FNB called Conexis X2, I did explain to the sales consultant who sold the cellphone to me that i already have a vodacom number on contract and dont need a new number or new sim card. I just need a cellphone. the phone was delivered to me with a 2 new FNB sim cards of which i don't want, I inserted my Vodacom Mobile sim and the phone asked me to enter a Sim unlock code!!!! I contacted FNB customer care of which was a nightmare of dropping calls and being sent from pillar to post. I eventually managed to contact someone at the call centre explained my situation and was told that I can only use the FNB Sim card on the phone, if i need to use any other sim card then I have to pay off the phone first. something i heard for the very first time when i made inquiries. Something which i was not told by the FNB Consultant who assisted me to get the phone. I mean what would FNB sell me a new cellphone then forces me to use their sim card. I'm really not happy with the service i received from FNB. Now i'm stuck with a new cellphone that i cannot use, this is unfair business trade from a well trusted bank like FNB.

I FEEL THIS IS UNFAIR AND WOULD DEMAND SOMEONE FROM FNB TO RESOLVE THIS.!!!