On Cino, you have the full autonomy to decide of how to split your expenses and with whom. When you agree to be part of a group, you enter into a trust agreement with the other members of the group. Cino has no say in who you share expenses with or at what ratio. As such, no disputes can be claimed with Cino if you disagree with a transaction made by another member of the group. Please solve this amicably amongst the members of the group.
If you do not want to share payments with the members of a group, then you can leave the group anytime. By leaving the group, your card will be deleted and you will be removed from any future group's payments.