Problem with this script?

So, I've made a Goal-Line technology script w/ part, and in the script it has a message, it then destroys the message, but cause the ball bounces in then out of the net, it makes two messages and only one gets deleted. Here is the script:

script.Parent.Touched:connect(function(otherPart)
	if otherPart.Name == "TPS" or otherPart.Name == "Ball" then
		m = Instance.new("Message")
		m.Parent = Workspace
		m.Text = "Goal!"
		wait(4)
		m:Destroy()
		end
	end)

How do I make them both get deleted?

There is a simple way to fix this:

1. Add a new script as a child of that script;
2. Make that script 'child' Disabled;
3. Make that script 'child' Name 'MessageScript'

The script 'child's code must be:

m = Instance.new("Message")
        m.Parent = Workspace
        m.Text = "Goal!"
        wait(4)
        m:Destroy()
        script:remove()

And then the normal script:

script.Parent.Touched:connect(function(otherPart)
    if otherPart.Name == "TPS" or otherPart.Name == "Ball" then
               cloneat = script.MessageScript:clone()
               cloneat.Parent = game.Workspace
               cloneat.Disabled = false
        end
    end)

Hope this helps! If it doesn't, tell me what appears in output. Thanks, marcoantoniosantos3