"RBD" - Report, Block, Delete

I get several calls, texts and emails a day. No caller or text ID, don't answer or respond, "RBD". Emails, always check the email address and or website after the "@" if it doesn't match the company name in the website, beware. And if there's random letters, numbers and symbols, "RBD". And the end of the website country code like CA - Canada, JP - Japan, UK - United Kingdom, "RBD" - REPORT, BLOCK, DELETE !!!