Rude behavior

Good Day

I have a huge problem with Maktub Security services who post as a debt collecting company on behalf of Makanda Finance.As this account should be prescribed these people keep on harassing me and even came to my work place. One of their employees was so rude and started swearing me on the phone using a lot of vulgar language and stating that she doesn't have any debt like me.I really don't appreciate behavior ,Their even threatened to legally attach some of my personal items to this debt and repossess them until the payment is settled.