when they are back up, find whatever 'export' feature they offer. Use it to save ALL of your records, preferrably in an open/standard/plain text format.
Do this regularly (daily, if it isnt too time intensive).
Then while you grin and bear their service, look around for a better solution for your bookkeeping needs. Use the exported data to test it.
Once you have found a solution you like, do one final export, load it into the new solution, and verify that you have ALL of your records, and then cancel Intuit. If they have access to your financial accounts/etc you might want to make sure that you contact your bank/etc and remove their authorization/access as well.
Once you've been free of them for a month or so, and you are sure you don't need them for anything further, consider contacting them and telling them just how badly you think they suck.