Ines Before dialing social services, it might be helpful to clearly communicate non-consent and give the parents a chance to fix this.
First of all, it is extremely irresponsible to go from never having worn a cage to 24/7 lockup without practicing.
Second, you have a right to privacy and your parents have no right to force you to give that up
Third, a contract with a minor regarding their sexuality is immoral, and if they refuse to let you return to your previous terms (stricter rules but no cage), that would indeed be abuse.