It could be spam, especially if you've never rented from that company. If you know the name of the company, put that in your search engine on the Internet and see what you come up with. In addition, you might be able to search the phone number on the text message.
In the past few days, I've had Kelly Services (a temp agency), the "IRS" (NOT - they don't send text messages) and various other companies text me.
It's the season for spam. Check it out first. Don't respond to the text!