Poor service

I took out a 24 month contract in January for a zte device that came with a sim. when i plugged the device on my laptop it didn't have network, so i called the call centre to get it fixed. the technician said it is the sim that is faulty and not the device. they said i should go to a cell c store and get a new sim which i subsequently did at eastgate mall. By then Cell C debited me for the 1st month in March 2016.the eastgate guy said for them to give me a new sim they will charge me R114 for the sim swap which i refused. so today i called the call centre to get the situation fixed and this woman Philile sends me from pillar to post. she sent me to blue label which sent me to edgars airtime call centre. when i called cell c again a woman called Mbali said i must buy a sim card that is not rica'ed and they would help me. i am already paying for something i haven't used. why should i run around like this if they can just send me a working sim!???