Stop the appliance and safely isolate it. Do not tug a trapped cloth while the unit remains powered, and do not use the motor to chew through the remainder.
What the observation tells you
Flexible cleaning materials can extend farther into the mechanism than the visible end suggests. A sponge breaking apart does not turn it into permitted food waste. Pulling hard may also move the sink-mounted appliance or its connections.
A useful next step
Keep the sink out of use until the item can be removed by a manufacturer-approved owner method or an engineer. Report any subsequent leak, unusual movement or sound rather than assuming retrieval resolved all damage.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.