still deducting money after cancelation

I have cancel the two contracts i had with telkom after they failed to give me my requested upgrade phones on January i was one month ahead with payments. Now they still deducting money from my account. This is by far the worst service i had with any service provider. I took out my contracts with 8ta when they were still good but since you changed to telkom mobile you guys are pathetic. I will be taking legal action against you for ********ly debit my account and *****ing.