Manage group

Hello, 

I am new to smarty. I ordered a sim for a family member and then ordered myself one. This has become a group. However the first number is not mine and my family member wants to take responsibility over it. I have tried to mange the group so that they can do this. My group plan is stating that the first number I originally ordered is mine, which is incorrect and it will not let me remove it from my group. I have tried the chat and have gotten nowhere. I have received sent an email to the smarty email but have not received a reply yet. Please does anyone know how I can separate these number so that my family never can take responsibility over their number. Many thanks Rachel