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He then said that he'd be back to withdraw the same amount - which is the maximum withdrawal per day - until all of his account was emptied.
Now, he says this was because of the conduct of the staff at the bank, but they say that it's down to the fact a security guard asked him to wear a face mask while in the branch.
Who is telling the truth? We may well never know.
What we do know is that the bank had to take out a s*** load of cash at his request, before counting out each bank note individually to make sure that the full amount was present.
This strange transaction took place at the Bank of Shanghai on Hongmei Road in - you've guessed it - Shanghai.
In a post on Chinese social media site Weibo, the millionaire - who uses the name 'Sunwear' - said that he was seriously unhappy with the service he received at the bank, without saying exactly what it was that they did to wrong him.
The bank branch, when contacted, said that a member of staff simply asked him to put on a face mask.
The rich dude accused the staff of having 'the worst service attitude' and boasted about having a seriously large amount of cash deposited with them.
Not for long, though. He added: "Because of this attitude, I can only withdraw all the money and put it in other banks.
"It was necessary to request them to count the cash in case it fell short."
Later on, images began to emerge showing the man loading up money into briefcases before taking them away in his luxury car.
Since this particular stunt, he has managed to grow his online following to around 1.7 million people.
Still, the bank maintain that none of the staff present that day did anything wrong.
They issued a curt statement that said: "The client's (complaint suggested) he had higher expectations of financial services."
They also reiterated their belief that the whole thing was because the security guard had asked him to cover his face, as per their coronavirus protocol.
We can't be sure whether the man came back on another day to withdraw the same amount, as he had promised.
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