Billing error by momentum and poor attitude

I am very disappointed with the service I recieved. I have been a member since June 2014 and when changing my cover option there was an error. I was billed R641 above what I should be charged. I sent 2 emails requesting that the issue be addressed and after not recieving any feedback on my quiery After 2 Weeks, I had to use my Minutes to do a follow - up. On complaining about having to be put on hold I was met by an abrupt and rude response from the consultant who was assisting me. Although my issue is said to have been resloved (awaiting month end to confirm) I am very unimpressed by the service I recieved.