@Jukka ********
No. What a load of nonsense.
1. I didn't hear the story second hand from the internet.
2. There are no "real" documents. At most they might put 800,000 in your account and withdraw it immediately. The money is certainly not there for the required 2 or 12 months. So, either:
(a) the letter that says that you have complied with the requirements is missing (and the IO has been bribed to overlook that fact), or
(b) the letter is a forgery, or
(c) the letter is misrepresenting the facts.
It's ridiculous to maintain the assertion that such a visa or extension has not been obtained under false pretenses when you have not in fact complied with the requirements.