Grif on my base

Hey i was building my base and then a guy showed up and killed me, thats fine i was naked, but then he started to place blocks on the midle of the base so now i cant remove.
The player that placed is moondiirt_3
Is there any way to remove them?
its all of the wood planks
2021-12-30_17.53.19.png 2021-12-30_17.53.25.png