Useless in setting up a debit order!

In November 2015 I was contacted by Ntombi regarding my vodacom account that was handed over and arranged a debit order. They didn't debit me in December. In the middle of January I received a sms saying I owe them money. I contacted Ntombi and told her I agreed to a debit order and they didn't debit the money. I then had to set up the debit order AGAIN! That time I spoke to a manager to set up the debit order the second time. I contacted them now AGAIN in February as they didn't debit my account AGAIN! This is making my name look bad for ITC! I spoke to Ntombi yesterday 16 Feb. and told her that this is my name they are messing up! She said she cant help me because their systems are down. If they don't know how to set up a debit order they must tell me so I can make other arrangements to pay. After the first call, Ntombi without realising dialed my number and I could hear her talk to her ***orker regarding what we had spoken about and how they were laughing about the whole situation they have put me in! This morning 17 Feb. Ntombi phoned and said they haven't debited the account so she wants to set up a debit order AGAIN!!! I asked to talk to her manager and I am still waiting!