Dont understand their own rules

After countless experiences in the negative it was an easy decision not to renew my contract with MTN after it expires. The easiest decision ever made in fact. So i went to their store in centurion mall to let them know i will be cancelling. This was yesterday the 4th of July. My contract ends on 2015.08.07. The consultant tells me I cannot request the cancelation fee now because it is not within 30 days of 2015.08.07. I asked for a copy of the terms and conditions where it states that I need to give 20 business days (1 month) notuce in letting them know I will not be continuing with the contract. So the consultant says i cant only do it within the last 30 days of the contract and the t and c says i must give one months notice. That technically means I can only cancel it on the 30th day before it expires and i have to go in store to do it. The cherry on top of the misery cake that is mtn. I have never had one positive experience from MTN