It is possible that your customer unsubscribed to the Tixt number and are no longer able to receive text messages. 


In order to subscribe back:

1. Text the word START to the Tixt number.

2. You will receive the following update indicating that you have resubscribed and will be getting the updates:

You have successfully been re-subscribed to messages from this number. Reply HELP for help. Reply STOP to unsubscribe. Msg&Data Rates May Apply.

This indicates that you've resubscribed and will be getting the updates from the Tixt number.