Probably because we did not receive the coins you are claiming to have sent to us.
there is no deadline date. On Twitter until October 31 was, but the coins changed on November 8?!?! So you can not exchange more? Many more have not changed with a large number of coins.
There WAS a deadline date, dev posted this here numerous times. It's you own fault that you missed the exchange, there was enough time to do that.