Account handed over to LGR Attorneys

i had two accounts with African bank which I defaulted on due to work reasons. The accounts were handed over to LGR Attorneys for collection. I have been paying R1500 on both the accounts instead of R2381 and R2111 respectively. I have been calling LGR every month month to check what my balance was, last time I checked I owed R63000 and R65000 on the accounts respectively. Today the 22 July I call LGR to find out what my balance is and I'm told I owe R77000 and R75000 on the accounts. When I started with payment arrangements I was told by LGR that there is no more interest being charged since the accounts were handed over. I am not willing to continue paying if this matter is not fixed. African bank is playing with and this is the last time I've paid the accounts because I'm fighting a losing battle. They can go to hell.