phone outage $100 ?

This screams “scam” even apart from the typos, the whole scenario is unlikely.   A real offer wouldn’t be “$100 free gift”, it would be something like a credit on your bill, paying $100 for a temporary less than one day outage is far too much, and you don’t want to survey just people who have experienced an outage,   Consider the recent data breach.   That, which was truly serious, got something much less meaningful than $100 “gift”!

Finally, those that blocked the sending number, what do you think that achieves.   Almost certainly an innocent spoofed number.