FNB Personal Loan Department Broken Communication and Threats by Groenewald and Lube Attorneys

I am being harassed and threatned by Groenewald &Lube Attorneys( endless calls, smses, and emails that they are going to trace my bank accounts and come to my work place) because I made an arrangement with FNB to pay my arrears amount on my personal loan. I am not sure if there is a break in communication line with FNB and the Groenewald Lube Attorneys, but FNB told me to ignore any communication made by the attorneys because I made an arrangement with them and am honouring that arrangement. Please its very uncomfortable being called and threatened by people I don't even have a loan with.