Continuous overbilling

About a year ago I asked for 2gig data to be added to my service. I was billed for that from the date I requested it. However I never received the 2gig but only 1gig. This resulted in my paying for data the moment I go over 1gig. I have reported it various times during 2015 and have received only one credit from Aotopage. At this stage Autopage owes me money for services paid but not rendered. The branch In Fichardpark keep logging faults with Head Office and nothing is resolved. You are earning interest on my money!! If I do not get satisfied reaction within (my money back), I will go to the newspapers with this compaint