Nimble/Edgars debt Collectors harrassment

Good day, I am a very angry client of Edgars right now from them selling my account to this pathetic company who harrasses me with calls on when i will pay when i have never missed a payment. My account with Edgars was sold to you not because i was not paying my account religiously but because they were closing down so they say. I am now receiving calls and sms's that i am in arrears, when i followed up with Nimble from a lady called Sweety she explained that when they received the account from Edgars it was already in arrears of R900 which i dispute because i was paying more than my monthly instalment every month and says i should dispute that with Edcon which i cannot because their line goes straight to RCS who are unhelpful. Now this morning i receive a call on my workline from Nimble and a lady by the name of Nomusa or Nombuso harrases me for me to pay the settlement amount after explaining to her im not in arrears coz Edgars was seemingly ****ing around when they sent my account to you. Furthermore she asks me if im going to pay today???How must i pay today when i pay every single month and you acknowledge the payment last made on the 23rd of December. Its not even end of the month and im harrassed for an instalment or a settlement. You are a pathetic company i dread the day Edgars sold my account to you. I have never ever missed a payment or shortpaid my instalment which you have been sending me from October yet your accounts department has the nerve to be bored and call me for payment. Stop harassing me ,stop you witches!!!!!!!