Telkom billing incorrect and cancellation

Hi. In July I notified Telkom that I will be moving and would like to cancel my ADSL account, which was on a month to month contract. I was told that they were having problems on their systems and to try again at a later stage. I then tried cancelling it again via the online platform, but battled. I then tried contacting the call centre and was referred to contact someone via email to cancel the account, and they confirmed it was done in August. I subsequently got billed for August, September and October (keep in mind I moved in July). It has been an uphill battle, with daily calls to Telkom, to reverse the bill for those months which I have hours on calls to the call centre. I've exhausted all avenues in trying to get this issue resolved, but Telkom refuses to assist.