No Service

My contract was upgraded on the phone. The phone was delivered but there was no sim card to put in the phone. The old phone had a nano sim the new one use a micro sim. I called customer service no where Iwas adv where I was adviced to call upgrades then they ad to call after sales then they gave me a Durban no. No one can help me. I made more than 7 ccalled and still nothing. I have the phone for 2 weeks and can still not use it.