Horrible service

I am so disappointed in this " credit limit " increase I received from TFG . I earn over 11000 rand and did a credit eval with them and they only increased my credit by 500rnd. When I opened my account with them I earned 4000 rand. And got credit of 1000 rnd and now my salary is so much yet I still only have 2000 credit with them? The nature of their products means you will pay more. Yet I can only buy one items and then get charged sooooo much interest. Definitely not using my credit and closing my account