MTN incompetence and ********* practices!!!

My home wifi contract ended and i received an email that i was on month to month, when i went to Blueroute MTN in Tokai i was told that i need to go cancel the contract where i opened it, that was very strange and it was too far where i opened the contact. I called MTN customer service and i was told there is no such and i cancelled. That month of cancellation i paid R800 and some odds as it was on month to month, today i received an invoice saying i owe R600 and some odds when i query on twitter inbox I'm told that the cancellation has happened now as it takes 30 days but this was not explained to me when i was cancelling and i was begged by the person who was assisting me to stay another month and i told him with the service i have received I'm done with MTN as i needed to call every month for signal being down!