Avoid Assistant to stop using the files content (type Retrieval)

Greetings, testing the assistant API, i as a user told the assistant to stop using the content of the files attached by me for its responses, and it obeyed the instruction, and for the next assistant´s responses it did not use the content of the files. Do you know a way to avoid this, cause i just want the assistant to respond with the context on the files no matter what the user tell it.

Did you add that specific instruction in the ASSISTANT instructions.

You are … …
In your answers you must always use the content from the attached assistant files and never create an answer without using their content. You must always use the file content even if the user asks you no to do so.