They should only need one biometrics appointment; but if you are unwilling or unable to get them to confirm the prior session it is better to get fingerprinted more than once than to risk having your application for immigration deemed abandoned.Quoting gaviota
If you wish to immigrate, you should of course attend your appointments.Quoting gaviota
If you abandon your immigration status, and have no other legal basis to be in the country but choose to remain illegally, you would be subject to deportation. I am not sure why you would do that, though.Quoting gaviota
You would benefit from discussing your situation with an immigration lawyer in advance of your scheduled interview.

