What are the rules (if any) on bashing?
Are there any repercussions for anyone who does it?
I'm speaking from the victims point of view here, but does being attacked 14 times in the last 16 hours count?

yes
unless you are at war with their alliance
if you were bashed, you can report it if you want to...and if their fleet was destroyed all 14 times, or at least 9 times, then its okay

how do i report it?

that i am not sure :/

if you were attacked by there ships on 1 planet over 5 times then it is bashing. if 5 of your planets got hit 4 times each it is not bashing. if you were IPMed 30 times you are out of luck you can IPM as many times as you like.
look for the Admin in the game & send them a PM to contact them.

How do i find an admin?

Email the admin.

just type in Admin in the search bar & you will find them.