iTunes/iCloud/Apple ID/Other Issues After Stopping Family Sharing

I used to be a part of family sharing with my dad and step-mom (they were the creator/heads). I disconnected from the family sharing later as it didn't work out for me. However, now I cannot change the billing address on my account from theirs to my own and I am now receiving emails from iTunes meant for me but that are addressed with her name. My apple ID has the correct name but the wrong billing address, but won't allow me to change it. I am unsure where else my billing address is incorrect as well as where the mistake in my name is. How and where can I correct this so my billing address is correct and my name is correct?