How Autopage ruined my life

I had an cellphone contract with Autopage in 2010 of which they were allow to debit my current account to my detriment this company debited my account 7 To 10 times at once several times and reversal ended up costing me R5000 in Admin fees. Couple of months later i lost my job n could not pay the bank n i got blacklisted. Now my credit score is messed up n im stuck with a dent in my name and cannot move into the future because im blacklisted for something i clearly had no control over, how does 1 company manage to ruin a man's life like this, why should i pay a debt made by a whole company when im just a hard working citizen. It is not fair that i cannot move on from this and cannot have a future because Autopage cannot handle people account, i wish i had not given them right to debit my account because clearly they were not equipped or just made a mess of things and my life