They'll get you in the end by waiting for a more belligerent political regime. Rumour has it that they favour world governments simply because it has only one voice. A weak voice that has to answer to all the various factions beneath it. You can go on as before providing you do not instigate war with other planets. They will not involve themselves with local interplanetary disputes.
Resistance is still futile.
In return for your co-operation, similar starships to that big one orbiting your planet will visit regularly and offer their 'support' to your people. They have laws prohibiting their interference with your culture and won't supply technology, even if it saves lives. They do offer to do the job themselves to repair any geological problem. No doubt this is to demonstrate their superiority as well ensuring dependency. You don't tell them that you've heard from other space-farers that these laws are frequently violated when it suits these arrogant starship captains.