My parents took my cell phone away after they saw i had used 10 credit in one

[Joy S]

day. what can i do??theyre angry? so my parents brought me a $29 cap phone. in this cap i have about $200 credit to use in a month. i texted my friends my new number and realised i had used $10 credit and when my parents found out they took my phone away and dont intend on ever giving it back. they assume that i will over-use my cred and a large bill will come their way and i mean i just got my phone and its already gone. what should i do?? thankss