The harassing text message number is so long.

I guess your card is not in a regular place, or your mobile phone number was published when you were online, and then those who sent text messages were an alliance, and your number was on their list. You'd better change the number, or block it with an information firewall, otherwise you can't stop their offensive. Or you can report those mobile phone numbers directly, but you are very tired, and you have to send more than N text messages a day. Then you change your mobile phone to NB and filter them all out.