I've been on Zecco for a year and a half and often seem like I'm at the end of the line in executions. They seemed move quicker with TDameritrade but I left to save on commissions.
Was your order an "all or none"? Have they sold yet? (2:00 p.m. EST)
Hang on to them, don't drive the price down. I have 800 shares. I'm look for a big bounce up to $16 bucks.
good luck,