Automatically deleted my device

I am a developer. I am using your android app for a month for free. I was sending packets from esp8266 to cayenne mqtt server. Few days ago all of my devices was deleted from my account. I wanted to know why this has happened? Is there any charges? If so, how can I pay.

there are no charges to use cayenne. are you still facing the issue?

I am not facing any issue. Thank you for your respose