Contract Mobile

I cancelled my mobile contract earlier than 30 days to the contract end date, I was told to call on the exact date when my contract ends. I then called again on that day, they confirmed that they cancelled. To my surprise they billed me on a month that I was not expecting them to bill me. Called again, they said they were going to escalate as they were going to listen to the so called recorded calls. I call again today and there is no record of any escalation. I'm writing this for others who might fall for this trap because I did. You actually pay more when you get contract with them mid month. I will cancel all the products I have with them and never ever again taking contract payment. Pay more but less bs. I'm done with Vodacom