Thanks for contacting us.
At this point once a main Planetary mission has been abandoned, as you have experienced, it is not possible to reacquire it. We are also unable to grant this mission to your character.
You can still continue your characters progress as your class missions will lead you to the next planet. As you won't be able to continue on the planet mission you may need to level through alternative means until you can move to the next planet (PvP, Flashpoints).
We understand the frustration this will cause, but at this time there is no other steps that can be taken.
This is honestly your response? "Sorry, you are just SOL"
The customer service here is insulting and a complete joke.