Exploited Customer

I'm am disappointed with Dstv, how they exploit their customers and pathetic customer service. We have been billed an exorbitant amount (R1612) for August after I claimed a free upgrade reward. When I called their center an agent apologized and said she has reversed the amount but her reversal doesn't reflect on my side. Now I've received an email from another agent claiming I short paid them that's why I'm charged R1612. Firstly I don't know how I can short pay since I pay via debit order. Your incompetence is infuriating. For such a big company you have questionable ethics. I'm so disappointed and angry with your service. Please reverse your error billing and charge me the correct amount owed. Stop *********** your customers. Smart card : ***