Poor service

I had a account with Telkom mobile which i cancelled, but they still deducted money from my account, this after i have cancelled this account 3 times. It shows on their records that it is cancelled, this i have seen with my own eyes on their sistem it shows \cancelled". They will be quite for 5 months and than just deducted 5 months installments at once. The staff at at the Telkom shop are very unhelpfull"