sick and tried of threating sms

I called thr call centre on the 22.10.2015 to change my debit order date from thr 25th to the last day of the month due to me change jobs,got the confirmation sms to state debit order date as begin changed on the 25th got a call to say no payment recevied,then the consultant tells me okay he sees it for the last day ,today i recevied n sms stating my account is in arrears trying calling so many times to the call centre no one answers the money is in my account pls take it,if ever my itc records are negetively affectef i will take this further.