calls repeated with threats

Callers from 8646636886 are calling me acting like they are a debt collectors they give me a number to call a firm which is 855-469-8414 but I call the 864-663-6886 back and it does not ring, they telling me that they confirm my address and work place and I need to sign papers confirming something charges against me would not say and they have contacted me many of times which I have not spoken them at all I said send them papers on and I would sign them but the lady called back and left a voice mail this was my last chance, must be one of the many scam call I get

Perverse and lewd comments.

Calls multiple times every single day for the past three months. It's an automated system claiming to be with some warranty company.