Final answer:
A suitable response from a medical assistant when a patient complains about treatment efficacy is to apologize and offer help without blaming or making recommendations. They should act professionally and help facilitate communication.
Step-by-step explanation:
The appropriate response for a medical assistant to make when a patient complains about their provider's incompetence and lack of improvement in their condition would be: "I'm sorry to hear that. Let's see what we can do to help you." This response is professional and empathetic, and it opens the door for addressing the patient's concerns without assigning blame or making unwarranted recommendations. It is important for medical assistants to maintain professionalism and facilitate communication between the patient and healthcare provider.