You were just lucky.
They got information that your phone number is really used. You might receive similar fraud phone calls/mails repeatedly and frequently from now on. That's exactly happened to one of my fellow traders. He received an absence notification from ゆうパック (delivery service by Japan Post). Unfortunately, he was incidentally scheduled to receive a parcel at that day, so he responded to it. After all, he had to change his cell phone number. (He informed me of his new number, and told the reason.)
Yes, for example, the following one.