Hi Diana,
I'm sorry you are frustrated with your experience with the iTunes Store. I'm curious to know if the interaction with technical support you mentioned above is the result of a recent call to Apple with the link I gave you, or if this conversation happened some time ago.
The previous contact information I gave you was to get help with your Apple ID, password, and security questions.
If your current Apple ID and password work everywhere but in the iTunes Store, I'll include a few more resources for reviewing your iTunes Store account and getting help from iTunes Store Support.
At the very least, you should be able to log into the iTunes Store with your current, active Apple ID and password and download something free to see if it is working.
See your purchase history in the iTunes Store - Apple Support
https://support.apple.com/en-us/HT204088
Sign in with a different Apple ID on your iPhone, iPad, or iPod touch - Apple Support
https://support.apple.com/en-us/HT203983
Your Apple ID is the account you use for everything you do with Apple: shopping the iTunes Store, signing in to iCloud, buying an app, using iMessage, and more. We recommend that you use the same Apple ID for all Apple features and services. If you want to change the email address associated with your Apple ID, sign in to My Apple ID to change your email address, then use these steps to update it in the services on your device.
- Tap Settings > iTunes & App Store.
- Tap your Apple ID. If you see the option to Sign In, you can change your Apple ID now.

- Tap Sign Out.
- Go to Settings > iTunes & App Store.
- Enter your Apple ID and password, then tap Sign In.
I'm including this link just to make sure the billing is all set up correctly in the iTunes Store. You will usually have to re-enter the code on the back of your credit card when you access this page. Even if you are downloading a free item, this information needs to be complete and accurate.
Change or remove your payment information from your iTunes Store account (Apple ID) - Apple Support
https://support.apple.com/en-us/HT201266
Diana, if the information I've provided here does not help you with your iTunes Store account, perhaps one of the folks on our iTunes Support team can help you access the store with your current, active Apple ID and password.
Contact iTunes Store Support
Take care,
- Judy