Rang my number but didn’t bother leaving a message.

I haven't picked up for this number since they’ve rung a couple of times previously. I tend to ignore any calls from unfamiliar digits that pop up on my phone.

I received a call from them at exactly 5:52pm. As soon as I answered, they abruptly hung up! I attempted to ring them back, only to be greeted by a recorded message stating their office hours都是9点到5点。这真让人感到困惑！ I do hope someone can clarify this weirdness!