E cash net USA I receive a letter saying I had out standing depth here but I don't have account with them they threating to take me to court is this real Nationwide

This is a scam. The letter is slightly better than it used to be, but it is still filled with incorrect statements, bad english and a total misunderstanding of our legal system.  Go to FTC(dot)gov and look up financial scams so you get an idea of what to look out for with these type of debt letters. 

Let me just state right off the bat that this is NOT real and is a very common scam.  These are scammers who are not even in the US trying to get people to give them money for debts that they do not owe.   They try to "scare" unsuspecting people by throwing out what looks like big words, Federal Agencies, and bits and pieces of terms you may have heard.

But if you actually sit down and read the letter, you will actually discover how funny it actually is and realize that english is not their first language.   I don't think there was more than one or two sentences in that entire letter that was even close to being gramatically correct.  So let me just give you a few highlights.

This will include instructing out the Federal Trade Commission, Credit Bureaus, and Employer etc.

- So what exactly is "instructing out"?

If we do not hear from you within 48 hours of the date on this letter

- Did you see a date?

And once you are found guilty in the court house, then you will have to breathe entire cost of this lawsuit which totals $5,428.15 which excludes the amount you borrow, attorney's fee & the interest charges.

- Really so can you explain how you "breathe" the entire cost?  Also, if the $5,428 excludes all of that, exactly what does it include? 

Unless you want to have some fun with them, the best thing to do is just toss those in the trash.  If you do want to have some fun and call them up.  DO NOT give them any real information.  I personally like telling them that I am an FBI agent in the fraud department.  Giving them the local FBI office number and address.  I've even had some tell me that the cops are on the way to arrest me, and I have told them why bother I am already at the police station.  Generally after that I get a few cuss words out of them before they hang up.

It's a scam. Ignore it and any phone call or emails you get.