Totally Dissatisfied with Cell C Services

Following my previous complaint about my Z3 that bombed out after 6months. I'd like to place on record that we are unhappy with the lack of service. I had to do all the running and phoning around. This morning i picked up my replaced handset form Cell C Shallcross. Firstly the handset was given to me in a very poor condition. The phone was switched on with its battery power extremely low. The phone didnt come in a Blackberry sealed box, it came in a plastic packet with prestik at the bottom edge. The clear screen protective film was stuck by hand with a host of air bubbles entrapped. I didnt want to complain about the condition as I already had wait 4 weeks for its arrival. I managed to have my emails and bbm to work but i could not send or recieve calls. It gives me a mm#6 error. I once again tried calling the customer care dept, but was told that the phone is blocked. My worry is that i dont know how old this replaced phone is and i should have been given a new phone as mine was only 6months old. Should this phone give me problems in the next month or so, i do not want to go through this ordeal again. If i cannot be replaced with a brand new Z3 then I want an equivalent