I don't see any logs of the spawner, are u able to show me the coordinates of where it was? Also do you have any screenshots?
This seems like its a report more than help as you are stating you probably got griefed. In this case you are required to provide evidence you owned the spawner or island coordinates for a refund.
I owned 2 spawners when I played Skyblock and checked on them 1 was gone. that's all the evidence I have.
I'm sure blaq did a proper search for logs of your spawner. But without logs or proof, it doesn't seen likely you will get a refund.
This seems more like a grief report than a question or need for help.. If blaq checked the logs and nothing is there, without good proof you won't be refunded. If you still want to try for a refund, make a report. Locking and archiving.