A Melbourne woman was accidentally transferred $10.5 million instead of a $100 return, now she has to pay it back.

Crypto.com is one of the world’s largest cryptocurrency trading platforms.

It’s now been revealed the company accidentally transferred $10.5 million to a woman in Melbourne Australia, when she was seeking a $100 refund.

It then took crypto.com more than seven months to realise the error.

The crypto trading platform launched legal action in the Supreme Court against two sisters to get the money back.

The court heard the company accidentally entered an account number in the payment field instead of the $100 refund.

It happened in May last year, but the mistake was only discovered in a company audit just before Christmas.

When crypto.com tried to recover the money, the cash had already been moved and used to buy a multi-million dollar mansion.

But now a judge has ordered the property be sold, and with orders made for the remaining money to be returned.