Absolutely disappointed!!!!!

I was billed without using the sim card at all. To make it worse, the amount that has been billed is way more that what I have to pay if I use the sim card. I phoned them, logged a call for a refund, it's now 15 days later and nobody has phoned me back to update me. With so much happening where we need every cent we can get, they have the audacity to bill my account and now frustrated because I need the money to cover important things.

I NEED HELP ASAP!! I NEED THE MONEY!!