Telkom Services not cancelled

On June 26th 2018 I went to Telkom's website and made a request for my services to be cancelled. They told be it would take a month to be finalised, and someone will call be to finalize my request. A few days later they called me to verify my request and my info. Yesterday I received an account dated 6Aug'18 with R437.59 outstanding. I went online and saw that I was also billed for Sep'18. Why was my services not cancelled? I can't be expected to pay for a service I don'y want and cancelled. If there was a problem, why did Telkom not contact me. Please fix this and reverse this account