CONTRACT INCORRECT AND PHONE OUT OF STOCK

I was contacted by Lauren of Cell C (Durban office apparently) regarding an upgrade I am due for. I was quoted R139.00 per month and promised the Samsung J1 Dual Sim will be delivered by the end of this week. The renewal contract has now been e-mailed to me and the contract amount is R149.00 and not R139.00 as stated in our conversation. I also called customer service to find out what size sim card the Samsung J1 takes and was now told this phone is out of stock. No-one can tell me what phone I will be getting and when. I cannot get hold of Lauren and have left a message for her to call me. I wish to cancel the contract since the contract amount is different to what was agreed upon in our conversation (which is recorded I'm sure), and the handset I want is out of stock. Please can someone from Cell C call me to assist.