Here's a simple method you can use to stop unwanted messages:
Option 1: Delete the Customer Record: If you don't need to keep the customer record, you can remove the customer profile entirely from your account. Just follow these steps:
Go to More > Customers > Search on your GoReminders account.
Find the customer by their phone number.
Open the customer's profile and click "Delete".
Option 2: Remove the Customer's Email Address and Phone Number: If you'd prefer to keep the customer record but stop receiving messages from them, you can remove their contact details:
Search for the customer’s phone number under More > Customers > Search.
Open their profile.
Delete their phone number and email address.
Set the Reminder Type to “None” and click "Save".
By removing their contact details, any future attempts to message you won't go through because their information will no longer match any records in your account.