Does any one know Robert Mueller?Why does the FBI keep writing me accusing me of money laundering?

Writes to me everyday and accuses me of terrorism, money laundering. Is it the real FBI? How come I am being written with these money transfers that I didn't commit to? He says I am a beneficiary of something from Nigeria. Then writes that I go to jail if I don't comply. Hell, do I know these guys? And if it is for real why do I need a diplomatic immunity seal? What's that for? I am just sitting here on my computer all day then suddenly this problem pops.