Harassment for closed account

After months of harassment but Nudebt over a cancelled account and email after email to Telkom I am now being harassed by P & P Attorneys for a completely different amount. They don't even have the decency to send me an email saying what the amount I owe is for, they just expect me to pay. I have references AI ********** , AI ********** and ********** 0. Obviously Nudebt realised there was an error on Telkom's side so now you trying to use another company to get money that you are not actually owed.