Letsatsi Finance is a *******!!!

I took a once off payment loan with Letsatsi Finance and unfortunately I had personal setbacks that affected my finances and ended up losing my job before paying back. I was supposed to pay R1580 back now I just got a call from their attorneys that I owe R4800? I mean what the hell??? How does it move from R1580 to R4800 within a year and couple of months? I want someone to call me from Letsatsi because I WON'T PAY R4800, I'M NOT CRAZY!!