I can advice to make posts about your situation. This helps a lot, if you make several posts, for example in Bitcointalk or elsewhere, so that Freewallet representatives will see that you are adding complaints and its better for them to let you withdraw BTC
Sometimes after one post a customer may get his tickets reviewed, but also some people cant get coins back even after month or years. Thats why it's better to make official statements, not to wait till administration pays attention to your issues.