MTN takes more than they owed!!!

So MTN South Africa I have a contract with you that currently costs me R909.01 a month. Somehow through your incompetence you debited my account with R2152.43. What kind of systems are you using for an error like that to happen?! I then contacted your Call centre 4 times today requesting that I be refunded today. Only to be told that it will take up to 72 hours. What audit needs to be done? Your call centre agents can see that you ****ed up but I need to wait 72 hours for MY money to be returned as your accounts department needs to do an audit to find the error. Then the 4th agent I spoke to assured me that someone from the accounts department will contact me by 5pm today. Guess what ****heads! I'm still waiting! Fix your stupidity. It's unacceptable that you take more than double the money owed to you and still expect your client to wait 72 hours for your **** up! For all you know I needed that money urgently and now I'm sitting without it! It doesn't take 72 hours to make an instant payment especially if you can clearly see you ****ED UP!