Telkom still deducting after cancellation!

I've sent Telkom an email to cancel my LTE account over 2 months ago. To make sure I said in the email to forward it to the correct person if whoever received it wasn't the correct person as you can't seem to find any correct cancellation details from them. I was at the shop and they told me I have to mail them. I'm so fed up with Telkom, I went through the same problem with my fixed line. Since then they deducted another month's amount, which I left, then they deducted a random different (lower) amount, this month they tried to deduct 3 times the original amount - I am very close to opening a theft case at the police station against them if someone doesn't fix this asap!