I'm experiencing the same massive pain point from Twilio. Our business sends survey links to about 300 people a day who have all opted in. We've been doing this

I'm experiencing the same massive pain point from Twilio. Our business sends survey links to about 300 people a day who have all opted in. We've been doing this for 7 years. Our undelivered rate had been under 5% for years. It's now at 33% and is threatening our business. Twilio's support has been absolutely dismal. They say things like "Your number is not attached to your campaign" and show a screen shot from their admin screen, but when I point out it is all connected in the console: they respond with the generic Twilio links about A2P implementation. Has anyone figured out a solution? ... I'm happy to switch to another company at this point.