yesterday I sent a balance from wallet to maple exchange
only a few confirmations, lost themselves and no deposit history
my balance is lost

Best way to get into contact with them is on their Discord server. Flavius (their dev) has been AWESOME about any issues that have arisen for our users.
Alternatively, you can send a support ticket.
I know that spamming all contact methods is a particular point of pain for them as Flavius also is their support contact... So please don't contact on discord and spam support... Discord will result in fastest response time.