Last point: Merely "not wanting to be involved" or annoyance at having to testify is not enough to get a deposition quashed. Every person has the obligation to give truthful testimony when subpoenaed unless and until a court says otherwise. By having the subpoena issued and served, one side's lawyers have gone on record that they believe your testimony is likely to lead to admissible evidence; to get the deposition quashed you're likely going to have to prove that wrong in a motion to quash or motion for protective order BEFORE the scheduled deposition date, but the odds would be very much against you even with a lawyer's help.