The survey is the survey, there is no need for a land owner to sign said survey unless of course the survey is a conveyance document, plat, short plat etc... Then the property owner would have to sign in order to execute the conveyance of property. The adjoining land owner however would not sign, unless they had some vested interest in the property being conveyed.
Typically if you disagree with a survey the course of action is to get your own survey and see if the two match up.
There are other laws about land locking property and cutting off access that may apply to this situation... Depends on your state and local laws...
