Thanks for reaching out.
It sounds like you're having an issue with the application as our system is not designed to block spammers in that way. If you have manually blocked a number on your account you will not receive a call from them at all, so this is likely not what is happening.
I'd advise refreshing the app and making sure it's fully up to date. If you need any help with that I've included step by step instructions below.
If you have any other questions or concerns don't hesitate to get back in touch.