Stop harassing me assemblief

Edgars please stop harassing me, since from last year June we had an agreement that i will pay R398.00 every month to settle my outstanding, you are charging me ridiculous interest of almost R80.00 plus the R45.00 monthly interest every month. I'm paying for calls which I've blocked and the collection letters which I've never received since last year. I've never missed a single payment since last year you are charging me unnecessary interest just to accumulate and generate income for yourselves. I've tried to get help on this matter and without anyone to help me I've given up. So please stop calling me about the account i dont need reminder as i pay monthly, LEAVE ME ALONE stop harassing me. You call me so early in the morning and late in the evening as if i didnt pay, please leave me alone i dont need you to call me for stupid things.