It's probably just a link preview. Which messaging app are you using? You can turn off link preview in settings if you're using Pulse sms. I used to see such link previews for sms containing short urls in them.
Why not better call them instead and ask how you guys send a 32-bit sms??
When they start receiving such calls they will themselves self-destruct and stop spamming..
I remember someone I know was getting constant daily calls+sms for credit card, he got so pissed off he did something similar for a month and thereafter he never ever heard from that bank. The story is way too funny I think everyone should follow the same pattern to get rid of such spammers...