Sorry to hear that, but I'm not sure I entirely understand.
It shouldn't be possible to get into that situation on Level 6, unless the letter that's in the way is a wrong letter that you previously dropped. If that's the case, you should be able to drop an adjacent wrong letter to create space, and then push the obstructing letter out of the way. Or if you have a bomb, you can simply blow up the obstructing letter.
Can you clarify?