Requiring urgent assistance

I took a loan from Old Mutual Finance in 2008 and then i failed to repay them on time therefore they forwarded my name to their attorneys and i agreed to make arrangements of repaying them through debit order from my bank monthly.The amonut agreed upon was 500.Since this arrangement they played hide and seek with me in the sense that i paid them but they made changes on their own because after a certain period of time paying they would phone me telling me that I am being handed over to another attorney for the reason i do not understand then i would make new agreements with the new offices now as a result this debt is not finished up all these years because of this hide and seek of these people ....because of the reason i am unable to particate on all credit exchanges. Please assist me