You certainly have an issue to discuss with the listing agent about how they represented the property to you, but on most listing sheets there will be some small print at the bottom with a disclaimer to say the listing information is deemed to be reliable, but subject to errors and omissions.
In your shoes, my first call would be to your attorney. Why was there never a conversation about what was and was not included in the HOA fees BEFORE you closed? It's the attorney's job to interpret the Bylaws for you and to make sure you understand the minutiae of what you are getting into, before you get into it.
Which is not to excuse a possible oversight on the part of the listing agent, but at the end of the day, you cannot expect to rely 100% on a listing agent who represents the seller, whereas you can rely 100% on your own attorney who only represents you. However, (and please don't take this the wrong way), while I am sorry that you feel cheated, you do also need to take some of the responsibility yourself for relying on what is essentially an ad that is only intended to give a broad overview, rather than the very precise and detailed legal documentation that followed. The devil is in the details as they say.