This one case is slightly more complicated in terms of how it happens. There was an offer for a free Chipotle burrito, and a number was given. However, in a issue about a phone number being local vs. national, people from a given location would instead find their text messages being sent to a local lawyer instead of the company. The lawyer suddenly found that he was getting a large number of messages asking about the offer rather than being sent to the company (link to article):
Chipotle offered a free burrito to anyone who texted "RAINCHECK" to the number 888-222 as compensation after the fast-service Mexican restaurant closed on Monday for a meeting regarding the recent E.Coli outbreak. The confusion occurred as some texters accidentally added an extra "2" to the end of the number, causing them to reach Levine instead of the number offering the free burrito coupon. "It started this morning around 9:00 a.m. when I suddenly got a text that just said, 'raincheck,'" he told Tech Insider. "Curious, I wrote back with a question mark."