Ask HN: What Constitutes Financial Malfescience?

TL;DR: Invested $40,000 in 2004 into a college fund. The fund, today is worth simply double. The fund wasa 529 college fund, and as stated, since 2004 has only doubled - it was with American Funds/Smith Barney. Is there any malfescience? How the F could this fund only do that? Do I have any recourse against the investment company?