In the UK you can report a spam or a scam text to do so forward the text to 7726.
An easy way to remember '7726' is that they are the numbers on your telephone keypad that spell out the word 'SPAM'.

Most countries have an option to report the spam text to your network operator.

My idea is to define / set this report number in Textra settings once set, click the 3 dots menu & click report spam / scam which will inform your network provider In your country