Poor business acumen by capitec bank.

I am really disappointed with capitec bank. I've banked with them for well over 10 years but never had such a horrible incident. I made a payment arrangement on my loan, considering my financial situation currently, but the bank debited a bulk of money in my account. They refused to rectify this error. Worse, they still call me to make more arrangements. Theirs is a devious tactic and I will no longer bank with them going forward. My level of trust and loyalty is completely destroyed.