Several things are wrong here.

The moment your balance went below 2 mbtc all requirements should be cancelled as the freespins winnings are lost at this point.
T&C say 40 times wagering requirement on winnings. Not a word about playthrough on the deposit.
The screenshot he attached with 0.00033740 winnings with 0.0134 playthrough confirms that deposited amount has no requirements.

Since he continued playing with a ending balance of 8.7 mtc then he should be paid 3.3 mbtc as winnings from the freespins plus the 2 mbtc deposit on top. 5.3 mbtc as a total.