Righty.
You say that you have no idea what happened. You confirmed you're the only one with access to your account and you've stated that you never withdrew any money or anything.
Explain to me why you're account was logged withdrawing money from your bank account at £99,999 intervals and then again at £999,999 intervals until it was empty and you were holding all your money in your hand between 6:36 - 6:43.
Then explain to me why you then gave the money away in intervals of £999,999 at 6:43 until you had no money left, making a final payment of £89,700 leaving you with £519 left in total.
You then stayed connected until 6:51 before disconnecting.
Explain all of the above.