Harris & Harris, Ltd. Debt Collection Complaint

Harris & Harris, Ltd. Debt collection department,

I do not know Cont'd attempts collect debt not owed Debt is not mine California

I have received numerous calls from Harris & Harris Lmtd. stating that they are a debt collection agency and I must call them. They do not have a live person on the line when I pick up, and provide no reference to said purported debt. As far as I know, I do not owe anyone any money. These repeated calls border on harassment and I wold like them to stop. If they have a legitimate claim, they would be able to contact me in a reasonable manner, with sufficient details such that I would be willing to address whatever the alleged issue involved.