Unprofessional Service

I took a 24 month Cellphone contract with Telkom mobile in September 2013. The agreed contract was suppose to end on the 1st of October 2015. I called them two months back to enquire about the cancellation process and I was informed that I should send through a cancellation request 30 days before the contract end date. I emailed the cancellation request on the 1st of September 2015 and did not receive feedback acknowledging my request till I spoke to a call centre team leader on the 23rd of September who promised me that my request will be attended to urgently. My contract is still active and nothing has happened from their side. This is really unprofessional as they are now bullying me to continue with the contract on a month to month basis.