THREATHING VOICE CALLS

So after my last review on this Company. Donavan the "Legal Advisor" called me yesterday to advise that I still owe them money. I then ask him to send me an email, which I receive from a gmail account? I check his number on TrueCaller and he works for a Distributor which has been noted as Scammers. I discuss the matter with my Director who in turn speaks to Donovan who now threatens to get the EFF involved? WOW, I cant even begin to express how I feel about this.