Apple iTunes/ID Problem

I have reset the apple ID/iCloud, iTunes and App Store ID on my iPhone 6+ and it is correct. However, each time I go to the app store I am prompted for the password for my ex-husband's apple id. Also I get prompts through out the day EVERY DAY asking for my ex-husbands password to his apple id. I cannot update any of my apps as a result. I have already spoken with Apple support and thought the issue was resolved, but its not. Please help.