Being Harrassed for an account / debt that doesnt EXIST!!!

I have never been this frustrated in a very long time getting calls fom ***. A number that doesnt exist when you call back. To be getting calls about an account or debt that doesnt exist in my name and never has is enough to make one go mad!! You call to harrass and ****** money out of people with no proof that the account exists? when proof is asked, you lay threats of ME facing blacklisting and poor credit etc. or you hang up in my ear? But you keep calling probably hoping i give in? What this company does is ******* at all costs especially when you cant come up with any substantial proof. Note this issue will be escalated to high authorities. Please dont bother making the excuse that your systems have been hacked or you dont know who is responsible for these calls, you are a "business", invest in better IT security of your systems and data and STOP calling people for money!!