16 days stay, possible not to have visa?

I would just like to ask something about our visit in Hongkong. I bought a ticket from Feb 13-28 from Phil-Hongkong, in total of 16 days. Ive read that the maximum allowed days without visa is 14 days. Im not fully aware when I pruchased the ticket taht there is maximum days allowed to stay. Is it possible to stay for 16 days without getting visa anymore? How much is the visa?

Thank you so much.