Hi, I'm Nathan.Sorry to hear that you're having trouble with this but I'll do my best to help you.
Can you tell me which model kindle you have?You mentioned both paperwhite and fire.
When you try to access the kindle store on the kindle, do you get any error messages?Have you ever updated the kindle software?
Do you need more help with this?If so, simply reply back on this page.
Please note: You have already paid your fee to the site; I'd like to help you and provide value for that fee, but I do need to communicate with you here to do so.