You have a right to fight this in court. You should have a case hearing date set for the "violation" and the VASAP officer should have informed you about the date of your case, if he wanted to extend the interlock 6 months.
I have routinely gone in front of Judges for similar occurances and been successful for my clients. You should hire a qualified attorney to represent you at this hearing.
Our office can be reached at 703-348-9808.
*Note: your results may vary from prior client case results.