Credit limit increase

When I app**** for a card at sport scene, the form came pre-ticked for automatic increases. I asked for another form and they said they didn't have anymore left. I then asked them to remove it and they assured me that it had been removed. Initially the credit I had app**** for was 4000 Rands and since then it has been increasing like nobody's business. I have spoken to a couple of agents over the phone and they assured me it wont increase anymore, I also spoke to someone at the sport scene store in sandton city and they told me the same thing. I just went to pay my account now only to find it has been increased again. I am now sitting with a balance of 8000 Rands and it says i can still buy for 5000 Rands. I just keep paying and to be honest its starting to feel like this will never end. I would like this account to be frozen until I am done paying it off. I would also like an explanation as to where my previous payments have been going. This is a *******.