I have a 2004 Pontiac Grand Prix that ha...

I have a 2004 Pontiac Grand Prix that has been giving me problems for years. I am extremely satisfied with the work that was performed and the timely manner in which it was performed. I do have one concern. I had a diagnostic test performed in September. At the time I was told that if I got the work done, the cost of the diagnostic test would be credited. That was never mentioned when the work was performed or when I was checking out. I was wondering did that still apply or does that only apply if the work is done the day of the diagnostic test?