Bad service

I have a personal with FNB which was in Arrears for 2 month, handed to over to Anders attorneys. Upon them calling me I settled the arrears then continued paying my account. I notified FNB to start debiting my account as I have sorted my financial issues...they have been doing so for the past 9 month and I have never skipped a payment. I have been harassed by phone calls and smses. I sent a polite email to Anders to say STOP calling me...My account is in order. Leandrea April sent me an email saying they will never STOP calling me until they get an instruction from FNB - My problem is what do Anders want to collect from me as my account is UP TO DATE. I once complained about the matter, I was told it was resolved. I see after 9 months the matter still is not resolved. FNB it took you two months to handover my account...please tell you collectors to STOP calling or Smsing me!!!