An SSN can only be claimed on one tax return each tax year. That's it. Once an SSN has been used on a tax return, and that return has been accepted by the IRS, it flat out can not be used again for the same tax year. Period. End of story. There is no workaround.
If the SSN was used fraudulently by another and they've already filed, then you have no choice but to print, sign and mail your return to the IRS. Again, there is no workaround. Once the IRS computers have an SSN marked as "claimed" for that tax year, that's it. You're done.
