Since you don't have SSH excess to box so only way that you can wipe box is via ftp (it ask for confirmation before deleting) or
seedbox file manager (selecting all file at once is not that common) & other details you are providing clearly showing that their server or any Tech person got messed up & you are now victim of their fault.
For your 17% full & 200
Gb space, it may be that you have been moved to some other server/ VPS without informing you or you are sharing same quota (fixed disk space) with any other user. This happen with many
Non-Pro providers.
From now be cautious while adding torrent of any high-level
trackers as this may happen again anytime & you may hit
HnR.