Horrible services messing up my credit due to system issues

This has been the worse experience - I opened an account 3months ago with incredible connection thinking they would be different to other providers but little did I know they are actually worse as my account and credit is messed up. I received a call 12 feb from a consultant who informed me that my account is in arrears of R150, I asked her how is that possible as when I opened my account I was forced to have debit order, she said she is not sure and will take it up with the accounts department will contact me back so she can let me know. A week later I received another call from consultant Caroline who told me the same thing that my account is in arrears of R150 of which I was furious and asked how is this possible due to signing up for a debit order it does not make sense. If I was a cash paying customer then by all means I could have but seeing that my account is selected to a debit order they will take the necessary funds out to pay ....she then told me she will call me back as she will escalate it to the accounts department as it does not make sense to her as well. Today is the 24th February I have not received any calls from anyone, I went to check my credit bureau and notice that I am in arrears with my account and I am so irate at this people that I called the branch I opened my account at which is wonderboom junction spoke to Lucas who said he will call me back as he will need to check with the incredible connection accounts department....he called me back told me that they said if the funds bounce back if there is no funds in my account this will cause a default....I told him the debit order is select that there is always money in my account so they must not come with any stories that I own them...it has been selected on the 25th of every month and they have been taking off the full amount for 3 months...this is a **** story. They putting innocent customer s in arrears with they system issues and something needs to be done about this...I want this fixed