Mr price account problems

So I opened an account and the account was approved with 1400 credit. Well I was happy with the fact that I can now finally buy on credit. Bought things that amounted to about 1200. Started paying the account but noticed it doesn't even reduce and when I went to the store I was told it's interest and card protection fees. Asked if they could change my plan from 12 months to 6 months they told me it's not possible. My account has been on a thousand and something ever since and it's not reducing.

I just want to pay off the account and close it I mean this is pathetic. To my surprise my grandmother is also having the same problem.

Why doesn't Mr Price ensure that their workers inform us that if we choose a 12 months plan we can't change to a 6 months payment plan and why don't they tell us that the account has 20% interest. I mean we should know what we getting ourselves into but they quick to call us and tell us how we shouldn't remove the protection plan as it protects our credit. I want everything cancelled then I'll pay the amount that I owe then I'll close the account.