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Saying they were collecting money from a payday loan threaten to arrest me

Threatening to arrest you for defaulting on a loan - illegal, per the FDCPA.  In any case, debt is civil, not criminal, so there would be NO arrest.  More info here:

Extortion Scam Related to Delinquent Payday Loans

Washington, D.C.
December 07, 2010  FBI National Press Office
(202) 324-3691

— filed under: Press Release

The Internet Crime Complaint Center has received many complaints from victims of payday loan telephone collection scams. Callers claim the victim is delinquent in a payday loan and must repay the loan to avoid legal consequences. The callers purport to be representatives of the FBI, Federal Legislative Department, various law firms, or other legitimate-sounding agencies. They claim to be collecting debts for companies such as United Cash Advance, U.S. Cash Advance, U.S. Cash Net, and other Internet check-cashing services.

According to complaints received from the public, the callers have accurate data about victims, including Social Security numbers, dates of birth, addresses, employer information, bank account numbers, and the names and telephone numbers of relatives and friends. How the fraudsters obtained the personal information varies, but in some cases victims have reported they completed online applications for other loans or credit cards before the calls started.

The fraudsters relentlessly call the victim’s home, cell phone, and place of employment. They refuse to provide any details about the alleged payday loans and become abusive when questioned. The callers have threatened victims with legal actions, arrests, and, in some cases, physical violence if they do not pay. In many cases, the callers harass victims’ relatives, friends, and employers.
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To File complaints FDCPA/TCPA violations:
Your State Attorney General
Their State Attorney general
https://www.ftccomplaintassistant.gov/#&panel1-1
http://www.consumerfinance.gov/complaint/

For Extortion Scam Operations,  File reports with the FBI, your state attorney general and Department Of Justice,CFB,FTC & FCC..

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

Contacting family members to get in touch with me. Threatning to come serve me papers at my job , threatning to involve my surpervisor, and Human resource department. Also has left several threatning messages on my voicemail, and has threatned to come to my job .

This is (one of many) criminal extortion scams that have been going on for years. Many are operating overseas and out of the reach of US law enforcement, while others are operating within the confines of prison cells here in the US, using contraband cell phones. Others are using VOIP. Either way, they are able to disguise their identities and locations, making them next to impossible to prosecute. There is NO "company" or "debt" and you will NOT be arrested. They are harvesting victims' personal identifying information and you need to do whatever you can to protect yourself. This includes: Notifying the FTC: https://www.ftccomplaintassistant.gov/, placing fraud alerts with all three credit bureaus, notifying your bank and employer and letting these criminals know you are aware they are attempting to extort money for a non-existent debt and have alerted the authorities.

Call saying I had 2 fraud charges would be arrested if I didn't pay