Do you have a sympathetic friend that you could stay with for a little while? If you do, you should try that.
Another thing you can do is if you have about $20, go to Walmart and buy a ‘burner’ phone- a little cellphone (not a smart phone) that lets you buy minutes for it. Keep the phone and the minutes hidden from your parents. Tat way if they take away your real phone you’ll always be able to call for help.