I cant see how i'm still paying

A few years back I paid furniture city a visit and bought myself a laptop to be exact it was the compact 615 and I recall doing with the consultant as she told me it was over a period of 3 year and I was cool with it , I mean it was only so much now over all this time checking my bank statement I find that this thing is still going and I never recall agreeing to this long term I am truly disgusted with this institution seriously how can you exploit people like this its just all wrong.