Memberstack registration + Twilio phone verification process

I would like to know if you have managed to solve your problem. My job is related to the fact that I have to call my clients before visiting my company’s office. I recently came across that my number does not allow me to do a newsletter, and I can’t understand the reason. So far, I use virtual numbers and make sure that my clients receive sms free. It seems to me that the fact is that I used my number too often, and it was added to the blocklists of some databases so that I would not spread spam.