I'm very sorry to hear you haven't been able to use the app. I'd love the opportunity to look into this for you.
Please reach out to me via private message. Click on my name ComcastJaredB and from the profile page click on the blue ‘send a message’ button. In your private reply please include the following information so that I may authenticate and access the account;
First and last name, mobile number, complete service address, and the last 4 digits of the pay method on file.