Exchange altmarkets.io steals!
Give us another exchange.
Please describe what happened, Altmarkets is a legit exchange. You should open a support with them if you have any issues, they will fix it for you.
The last order was gone and I can’t withdraw DOGE ...

Support does not work, always gives an error.
What do you mean, support does not work. I bet you are trying to login, using your exchange credentials. It's seperate, create an account and raise a ticket - bingo.