Received contract doesn't correspond with call

5 June 2015 Cell C contact me to upgrade my contract which will expire end July2015. After all the confirmations of my personal details - which are tape recorded. I agreed on the following:<br> Samsung G920 Galaxy S6 flat 32 GB, +wireless charger. <br> on straight Up 100 at R589 pm x 24, 12GB free data for Samsung galaxy s6 promotion.<br> Straight Up 100 postpaid (100 sms,100min,100mb). They promised that the phone will be delivered on Monday 8June15, I need to sign the contract - BUT only 3GB, instead of 12GB was on the contract, I immediately phoned 084 145 and sent mail to disagree with the 3GB. After 1 week and several calls I am not helped. when you phone Call Centre you are transferred to other people, which transfer you to other people.<br> My question is: is that 12 GB promotion still valid? Where is the lady who phoned me on the 5th June 2015 who made all these promises and assured me that her personal e-mail will be on the contract if any further enquires occured