Big submitting mistake

Hello there ERPNext Community!

I have just made a big mistake!
After succesfully importing my “payments” I noticed i made a big error in the importation.
Unfortunately i was stupid enough to “submit all” after import, which means i cant mass delete or edit them.
Is there anyway i could have a quick redo somehow ? Or do i have to go in and manually cancel all of them ?

I think, you will have to delete ALL of your transactions from your Company Master, and then reimport your “payments”

i have to manually cancel them ? there is no mass cancel option ?

When i reimport, if i choose not to submit them, can i mass submit them after verifying all is okay ?