Debit order confusion

I called Vodacom on 23/09 at 16:20 as my debit order scheduled for the 20th had not gone off and was advised that there was a problem with debit orders running on the 19th and 20th. I had an option of manual payment or to have the debit order go off on the 29th. I chose manual payment and proceeded to pay. Lo and behold on the 25th my current account was debited as well. I want my funds back immediately, a letter of explanation as well as the charged that my bank will charge for going into a debit balance while having no overdraft. This is utterly disgusting!!!! I WILL be taking my business elsewhere.