Old woman being overcharged and not given information!

I would like to say, I am extremely disappoitnted inStandard Bank and their staff!!! My mother who is now a pensioner took a credit card in 2013 to buy paving bricks that cost around 6000.00. She solely used that card for the bricks and never again, but has been paying this for 5 years now going onto the 6th year. Is it possible for one to pay 6000.00 for 6 years????? There is no statement or anything that shows what her balance or settlement is, or was her card cloned seeing that she is old, and someone else is using it while she pays???? The staff is doing nothing to investigate! I suspect something sinister is going on here! Robbing the old and helpless. Now she is not working, so being a responsible citizen she went to report this to the bank, but no indication was given as to what is going on with the acc. She was merely told she needs to come up with a plan to pay the account every month!!!I am livid!!! I think we need to take this matter further!