Worst Customer Service!!!!!!!!!!

Worst customer service ever!!!! I have lodged complaints to MTN since the beginning of September regarding their rush hour services and how I still paid for making calls even after i bought rush hour. After several arguments with their consultants, I was told that I should have not been double charged for this and that MTN will rectify this within 21 working days. I have been waiting since then and have been contacting the customer service with no success, I am very disappointed in their service and the fact that they keep double charging me every time.......they are quick to remind you of what you need to pay but fail to address the most simplest issues.......Please tell me what it takes for us to get our issues addressed, disappointed "former loyal" customer.