Incompetence

I was hoping for some assistance. For the past 2 months, the above company has contacted me stating that I owe money to another company.

I have called in numerous times and sent numerous emails requesting an invoice as to exactly what it is I owe.

And to this date, I have never received an invoice. All I receive are weekly threatening emails stating that I do not reply nor contact them ...

I feel this company is completely ***********. Can you please assist in dealing with them?