Bad Service

RCS has been debiting my account since inception every month. Last year December my debit order didn't go of, I only realised in January 2015 upon receiving a sms from them so I phoned in and asked why my account was not debited and I was advised that the debit order was unpaid and I said that is impossible as even at the time I was phoning was there money in my account. I have send through a copy of my bank statement showing that there was enough money in. So I was advised that they will run the debit order again and it didn't go through again. I had to phone in again this time I asked for the banking details which was provided to me but I received an error that the details are not correct so I phoned again and I was advised again that the debit order has been set to run up to today no debit order ran since December 2014. I have to use my airtime every time to phone and to be put on hold where I'm still not getting any joy. I was assured last week that the debit order will run on 6 March 2015 yet again this never happened. What is the use of a debit order being in place?????