Thanks for reaching out to TextNow support! We regularly offer chat on Sundays, but today we ended up short staffed and had to close down our chat earlier than normal. I am very sorry for any inconvenience that this has caused.
As for your data usage, I have looked into this for you and unsuspended your account. Your service should restart momentarily. Please keep in mind that data usage does not roll over instantly, and may take up to 24 hours to show up on your device. Regardless, Your service should be back up and running again.