Just got an reply from bitmixer support team about when they are going to solve this matter.
Hi,
Unfortunately there are no ETA at the moment.
Best Regards,
Bitmixer Support
I think you shouldn't worry. If they didn't close down the campaign and didn't disable the bot, making it still possible for new participants to join, they still have money to pay you and are planning to continue. I hope they'll show how reliable they are and resolve this ASAP.