Take a screenshot and send it to Twitter @talk2Globe. It's the easiest way.
Hi margie, here a procedure on how to stop spam messages on your device, kindly follow the instruction below:
For Android devices:
Go to Messages, then tap message setting, then Click “add to spam number and add spammers’ numbers
For Iphone devices:
Open the message, click “Contact" at top right corner, then click the I next to the number you wish to block, then
Scroll down to the bottom of the page to see the option ‘Block this caller’