I have received no less than 20 calls from a blocked-unknown-private number in the past two days, all of whom claimed to be from "The US Government Grant Department," "Loan Department" and various permutations. I have told them repeatedly to take my number off their list, which results in an immediate hang-up from them and another call from a different representative within 15 minutes.

Today somebody obviously goofed and amid the dozen blocked calls I received two calls from UN-blocked numbers:
404-594-8049 out of Georgia
323-524-0755 out of California

Both claimed to be from the US Government Grant Department.

I told both callers that I was putting them on legal notice to remove my number.

The caller from California copped an attitude and told me to go ahead and press charges!

Most of these calls are coming from India and Pakistan. They are using spoofed numbers. All you listed are known tactics to getting people to answer their phones.

To report the fraud, go here:
http://www.grants.gov/web/grants/support/general-support/grant-fraud.html
Their number is listed , along with an email address, at the top of the page.
Also here:
http://www.consumer.ftc.gov/articles/0113-government-grant-scams

http://www.usa.gov/

To file complaints on Foreign company's and scams:

https://www.econsumer.gov/#crnt
eConsumer.gov: Report Your Complaint
E-mail: econsumerwb@ftc.gov
http://800notes.com/forum/ta-d20d86fdc3e145c/reporting-international-scams

Consider getting a call blocking device or phone.. You can google them and many are around $40.00 or so. If its a cell phone, some already have call blocking, if not, there are free apps on the web that will work for some. You can google this. If you have a smart phone, there is a free app called call control. Iphones appear to have apps also. Another one is called Mr. Number. For tracfone & straight talk:

https://play.google.com/store/apps/details?id ... .tracfone&hl=en
http://extras.straighttalk.com/en
http://www.youmail.com/home/carriers/straight-talk/block-number
https://www.straighttalkwirelessforum.com/viewtopic.php?f=6803&t=55006

For text messages: forwarding any text message spam you get to the short code  “7726,” which spells “spam” on most phones, to alert your network operator to the abuse. ATT won't accept 7726 But they will accept BLOCK and return a message that the web site is blocked. forward the texts to 7726 or BLOCK, depending on your phone carrier.

I received a voicemail from this number heavy accent could barely understand anything had to use the voicemail feature to read the number back, but I'm to believe that this is about a job opportunity in my area.

left msg with thick accent about a job.  could not clearly understand. blocked.