Motivated and awakened by being the possible dupe in this "Nigerian" scam, I searched for an authority to which I could report, especially in UK. I discovered the authorities in UK had no interest to investigate Internet scams. After receiving the third phone call from "Mr. Herbert Distel", I simply told him that his name is on Google. He immediately hung up.
I also discovered many corruption problems within and out of Nigeria.
The best relief I could find was, "Be aware of scams, especially ones that claim to make you rich". The old axiom, "If it sounds too good to be true, it probably is not true".
Game over.