Disappointments from MTN

in September I received my monthly statement from MTN which showed that R1600 is due. on the day of the debt order R1800 went of from my bank account I then queried this and MTN informed me that it was self service ... firstly I have no idea how to activate this self service I have emailed MTN asking them for possible a SMS or an email or anything in writing that shows proof that I went and actually activated this self service I have always known to pay the amount for both my contract phones and only the minutes sms's and data , I am still waiting for this proof where I actually went and activated this ******* myself. then secondly I have requested that instead of debt order I rather pay via EFT. I called the call centre in this week and they said that it was still showing debt order I then called again. and then the call centre agent change it and informed me that an SMS will e sent to me confirming that its now EFT but no sms was recieved after more than 24 hours and no SMS has been received..