harrasing calls

I missed a months payment on my repayment, I received a call mid July and requested to pay the half of the overdue amount end of July, I have been receiving multiple calls from Capfin's agents about the same thing to the point that they are now calling my work number as if i have been missing or not paying my account at call, this is now being harassed over 1 months payment of R1100. please fix this as it is giving me a bad image at work i cant be harrased like im not paying Capfin at all over a months missed payment really.