Boot camp didn’t work (corrupted fusion drive)

So I tried to install windows 10, everything fine until windows started up, then said windows could not install. So It automatically rebooted in Mac OS (latest version btw) and rebooted back into the windows setup, everything was fine and then another error came up with: couldn’t not find a partition. So I quit it and rebooted onto Mac OS, and Mac OS only had 300gb , and boot camp failed to remove partition it created. I went to disk utility and saw there was 700+ gb of free space assigned to nothing. Every time I try to assign that space to the macintosh Hd it says failed. I will provide pics if someone can help please :(