Complete scam.  No one gets a heads up they'll be served - the process server just shows up, unannounced.  If you had an unpaid loan, you would also have gotten dunning letters via USPS mail.  Any caller who asks or pressures you to pay immediately - and especially with prepaid debit cards - should be considered a scammer.  BTW, garnishment cannot take place unless you've been served, gone to court, LOST your case and then a judgment entered against you.

http://800notes.com/forum/ta-86217073a9c8dad/ ... 077595690349410
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http://www.consumer.ftc.gov/articles/0258-fake-debt-collectors
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http://www.deadiversion.usdoj.gov/pubs/pressreleases/extortion_scam.htm
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Also read up on the laws and your rights:

Harassing calls from a debt collector? Here is what you need to know
http://800notes.com/arts/Jb8EW-eDhQA/harassin ... ou-need-to-know

http://www.ftc.gov/os/statutes/fdcpajump.shtm

CFPB Q&A on debt collection practices
http://www.consumerfinance.gov/askcfpb/search ... debt-collection

http://www.consumer.ftc.gov/articles/pdf-0096-fair-credit-reporting-act.pdf
http://www.consumer.ftc.gov/articles/0149-debt-collection
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Follow the steps in what you need to know. A legitimate debt collector agency should not have a problem with giving you a real business name and address you can google and verify via google street view, BBB etc.
For extortion Scam Operations, file reports with the FBI, your state attorney general and Department Of Justice,FTC & FCC..

http://www.nw3c.org/
http://www.ic3.gov/default.aspx
http://www.fbi.gov/
https://www.ftccomplaintassistant.gov/#&panel1-1
https://esupport.fcc.gov/ccmsforms/form1088.action
http://www.consumerfinance.gov/complaint/

And folks should consider looking at maybe getting call blocking device or phone....you can Google them and many are around $60 or so.

Don't give them anything.  This is  a scam.  Nobody is going to serve you documents.   Only judges can issue garnishments and that only after a hearing where you would be given a chance to be heard.  

Report this to local police and attorney general.

See:  https://www.consumer.ftc.gov/articles/0149-debt-collection

The caller stated that I will be served legal documents pertaining to a cash advance from splash cash.  I am yo give them money from a prepaid debit card to stop the garnishment and to stop the server from serving me