If you had a tax return prepared by a tax preparer where some error resulted as a result of the tax preparer where you owe an additional $700, I would meet with the manager of the tax preparation place and see what accomodations can be made as to you. If you cannot resolve the issue with the tax preparer to your satisfaction regarding the $700 issue, your option could be to file a small claims action against the tax preparer's office seeking this amount as your damages.