Harassments over R600

Truworths will cost me my job if they don't stop calling me everyday as if i owe them R50 000. I am receiving calls from Truworths everyday and i am extremely annoyed. Firstly I never app**** for the ****** account i just received a card at my doorstep little did I know i had received a card from the devil himself. I have been receiving smses to say i must pay R310 sometimes i would even pay more this past month we had a funeral in the family and i paid R160 instead of R310 my outstanding balance is R680 for goodness sake after missing only R150 i am getting calls everyday I made an arrangement to settle and close this account on the 3rd of March 2021, whatelse must i say to ur Truworths consultant, I am tired of this unnecessary calls can they stop with immediate effect if i lose my job over R680 Truworths will u hire me?