Telkom cancellation Nightmare

i had 24 month contract with Telkom( which finished on 07 December 2017 on the 9th of November 2017 submitted the cancellation form, spoke and re-submit to six call centre agents since January this year, Telkom is still billing me on month to month , i am paying for a service that i am not using, everyday of the week i have to call do the re submitting of the cancellation form over and over but no cancellation on my account