Cancelled Service - still being debited

Telkom us useless when a service is cancelled. My director cancelled his ADSL line 2 months ago and is still being billed. I cancelled our office SIM card 6 months ago and we are still being debited. Previously it took a year after the cancellation of my personal ADSL for it to be cancelled and a credit to my account to be made ! Unbelievably unorganised and slow service if it can be called service at all !!