How I deal with Telemarketer
Disclaimer: For education and learning purposes only, I take no responsibility for what you are trying to do.
Very short, search for this text or similar:
By subscribing, you agree to receive recurring automated marketing text messages (e.g. cart reminders) at the phone number provided. Consent is not a condition to purchase. Msg & data rates may apply.
And then put in the number that just called. :)