Constant Harrassment

The employees of NBA is harrassing my husband at least 2 - 3 times a day about alleged outstanding debt from an ABSA account that he has closed years ago. Everytime he asks them for the proof of the money owed they say they will send the proof but they never do. They keep on threatening him with legal action but they never give us any specific detail or even contact details. And by looking at all the complaints I feel it should be taken furhter. As this type of harrassment is unacceptable. Who knows how much money they actually ***** from people who are too scared to challenge their ******* allegations and fall prey to their empty threats.