Cancellation of mobile contract

Hi took a contract in August 2016 I called in to customer care in in July 2018 requesting for services to he cancelled however. When I called customer care in August no one answered I waited hours on end for someone to speak to me I find this absolutely disgraceful as I am now being charged 2 extra months when my service should have been cancelled. I called in today and the guy tells me I need to cancel online. The contract was done telephonically via the outbound channel and not via the website. The services and agents of Telkom are poor and pathetic when it comes to customer satisfaction. Till date I am still unable to cancel contract and am being charged way past of what should have been the end of the contact.