Has anyone here used Telnyx? I tried to build a product against their API last year and 3 weeks after signing up they banned my account and made it impossible to get an answer as to why or re-enable it.
I like it so far. Did you call phone support at the time and ask about it? I find it's easy enough to get in a call with a human.
I've had a pretty good experience using it to send SMS. Any chance you didn't get a 10DLC or toll free verification and tried to send too many messages?