These messages are scams and you should never reply to them. You may have the desire to respond to the message, but if you do, it confirms that it’s an active number and the spam will continue and possibly increase.
If the spam message includes a link, do not click it. Links in the message may take you to a fake website that may ask for your personal information
Forward the spam message to 7726 (SPAM) so it can be investigated and actioned. Reporting spam is free and does not count toward your data or text message package.