swift funds llc threatened to destroy credit rating unless past due deliquency was paid - or else Internet

Received a call today from Swift Funds LLC, tel number is 888-479-4384. claimed to be a collection agent for health and fitness company and threatened that I should cooperate and pay a delinquency from 2 years ago at a rate of $25 per day on top of the original amount plus a penalty interest for the entire time. would not give me amounts but immediately started to threaten me with filing my delinquency with the credit bureau and will immediately cause a negative impact on my credit rating.

I started to question this 'unknown' delinquency,  and was reminded repeatedly that I should 'settle' this issue now, BEFORE it's too late and I'll have more problems in trying to resolve this on my own. In fact, this person (name unknown) did state that I will have no alternative but to settle with him, if I wanted to prevent my credit from the negative impact.I thought it's against the law to try to intimidate debtors, especially with his 'bum's rush' with no details to give me. Caller: Swift Funds LLC