A week still dont have my money back

I am so very angry. I have never had issues with miway up until now, and I remember saying to the Agent that miway sounds too good to be true. The call centre agents are friendly and always willing to assist. Up until today where a miway deducted twice the amount they were suppose to deduct. And I called in to enquire, the lady I cant remember her name said she was going to call me back and she didn't. I then called again and a lady by the name of Keneilwe L. She said it will take 72 working hours. And its been 72 hours gone and I still don't have my refund yet. Like this really made me angry, I understood it was an error from their side but to take more than a week to refund my money back. Its not acceptable at all, I always tell people about how good your services are but this really has put me off. You encourage us to rate your services so please make sure you live up to your word.