More and more charges!!!

I tried cancelling my Telkom ADSL line but was in arrears, I told them I will bring the account up to date as soon as I can (I have been retrenched), I have also moved house so I am no longer using their services... BUT they are still charging me R800 monthly so the account still keeps on going more and more into arrears. Instead of just freezing the account and letting me pay them back...

Is this how you treat customers that have been with you for years with multiple products and account in good standing (except for now)