Telkom attempting to take money out of my bank account and payment was already made for account.

Yet again having issues with Telkom. I paid my account via Pick n Pay after being over charged and my account being declined for payment as I didn't have sufficient funds because I was overcharged. Never the less. I went to a Telkom store. They told me what was outstanding and I made the payment. The payment reflected on the Telkom app but I just noticed on my bank account that Telkom tried to pull almost double the amount off of my account which has left me bank charges and my bank account in arrears. Why is Telkom trying to take this money from me when payment has been made for my account. This is unacceptable. I am so fed up with Telkom.