If someone lies in connection with a legal proceeding (under the penalty of perjury), then they can be liable for perjury. The difficulty, as you probably have learned, is that prosecuting people for perjury is uncommon. It would have to be a big ticket item for the District Attorney to go after them - - not impossible but highly unlikely.
You will need to bring this up to the Court, though, so the Judge is aware of what is going on. Have you proof available. Then, focus on the case itself and don't get side tracked with the perjury issue.
I hope this helps and wish you the best with this troubling situation.
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This answer is offered for informational purposes only. It is not offered as, and does not constitute, legal advice. The laws are somewhat different in every state. You should rely only on advice given to you during a personal consultation by a qualified and licensed attorney in your area who is thoroughly familiar with state laws and the area of practice that your issue relates.
The penalty is perjury, but the chances that the party is actually prosecuted is pretty slim. The more important question is what damages or consequences you sustained as a result of the perjury. For example, was there a default and default judgment entered against you whikle you were out of the country? If so, you would be able to set aside the default and vacate the default judgment.
Your question also does not indicate how long you were out of the country, Are you saying that a motion was filed when you were out of the country so that you had insufficient time to file a timely opposition? If so, you should still file a written opposition, and include in your declaration that you were out of the country for whatever period of time.