Double billing customers on debit order

Customers were billed twice today, at 8am this morning and were only notified at 8pm. The earliest these overdeductions will refunded Monday 4th Jan. 2016. This is unacceptable you will return my money by the close of business 2nd January 2016 or I will be changing service provider immediately. Also you have caused me to go into overdraft, All my debit orders are going to bounce. I require an apology letter to my bank and your commitment to cover all the bank charges I have incurred due to your negligence, improper and above all most unprofessional manner in resolving this situation. Could you please tell me how much interest Vodacom has made due to this so called error? Please bear in mind that I will also expect the interest on the money you so called erroneously deducted from my account. Personally I think that this is a **** on Vodacoms side. I expect a response as a matter of urgency. How foolish does an organisation have to be to double deduct money from your subscribersat this time of year. Please have the courtesy to respond to me with applausable explanation if you have one! Do not try to insult my intelligence with some idiotic response. I am disgusted to say the least.