DarkRP PlayerSay/PostPlayerSay

[YaYaBinks3]

Hi,
How can I hide a certain chat in DarkRP?
Using PlayerSay and returning false doesn't work, and neither does it work in PostPlayerSay. How do I hide a certain chat in DarkRP?
Here is a snippet of my code:

hook.Add("PlayerSay","groups_menu_chat",function(ply,msg2,team)
	local msg = string.lower(msg2)
    if msg == "!group" and team == false then
		openGroups(ply)
		return false
	end
	if msg == "!accept" and team == false and ply.GroupInvited ~= nil then
		groups[ply.GroupInvited][3][ply] = {["Role"]="Member",["Player"]=ply}
		coroutine.resume(coroutine.create(startHandleOfGroup),ply:SteamID(),ply.GroupInvited,groups[ply.GroupInvited][1])
		for _,v in pairs(groups[ply.GroupInvited][3]) do
			net.Start("refresh_playerlist")
			net.Send(v["Player"])
		end
		ply:SendLua('chat.AddText(Color(0,0,255),"[RealRoleplay Groups] ",Color(0,255,0),"Accepted group invite to the group ",Color(255,240,0),"'..ply.GroupInvited..'")')
		ply.GroupInvited = nil
		return false
	end
	if msg == "!decline" and team == false and ply.GroupInvited ~= nil then
		ply:SendLua('Color(0,0,255),"[RealRoleplay Groups] ",Color(255,0,0),"Declined group invite to the group ",Color(0,255,0),ply.GroupInvited')
		ply.GroupInvited = nil
		return false
	end
	if string.sub(msg,1,4) == "/gm " or string.sub(msg,1,4) == "!gm " and team == false then
		local donesomething = false
		for i,v in pairs(groups) do
			if v[3][ply] ~= nil then
				donesomething = true
				for _,v in pairs(v[3]) do
					v["Player"]:SendLua('chat.AddText(Color(0,0,255),"['..i..'] ",Color(0,255,0),"From '..ply:Nick()..': ",Color(255,0,0),"'..string.sub(msg2,5)..'")')
				end
			end
		end
		if donesomething == false then
			ply:SendLua('chat.AddText(Color(0,0,255),"[RealRoleplay Groups] ",Color(255,0,0),"You\'re not in a group yet!")')
		end
		return false
	end
end)

[rejax]

return ""

[YaYaBinks3]

Thanks :)