Exceptionally poor service

Exceptionally poor service - Received a invoice for ? R14500. Logged a dispute. They then sent requested detail to wrong e-mail address after being given the correct one. When calling in the call gets cut off for no reason. When not cut of the standby time on waiting for someone to assist is ? 10 minutes on a good day to ? 45 minutes or more on a bad day. What can I do to have this sorted out? I am still waiting for SMS's to notify me that I have exceeded my data gap. They are quick to send me a reminder for the outstanding amount and reminders that non payment will negatively affect my credit profile. <br> Please note MTN - this is still being disputed!<br> Can't wait for my 5 contracts to end with this *********** company!