Thank you for your post and welcome to the Community!
I'm sorry to hear of the issues you seem to be experiencing with the sponge of your headphones has torn. I'll do my best to point you in the right direction.
In this community, we focus on providing troubleshooting to our customers that are experiencing technical issues with there products. The issue you are experiencing is going to need a customer service representative. If you reply with your location I'll be happy to send you the contact details for support in your region.