asks for billing update errors out on family share plan but charges credit card each time and can't update apps

My billing information needed to be updated on my family share plan. I updated the billing information and the red circle disappeared. I am able to download app updates again on my iPad. However, on my other device (iPhone) I cannot. On my iPhone it shows I have the family share plan credit card as well as the old billing credit card I used with the device (iPhone) before I decided to join the share plan. The only card I can edit is the old billing card which is still an active credit card but I can't remove it. However, if I try to update apps it says I need to contact family share plan owner, which is myself, and when i try to update the second form of payment card information it fails to update and charges the other card $13.99 immediately and errors out stating "billing security code invalid". So i have five charges on my account for 13.99!! and i cant update apps on my iPhone!