I know you must be frustrated. Ear mites can make a dog feel miserable.
I've had dogs for over 20 years and I have dealt with ear mite problems.
The bad thing with ear mites, is that they can cause an ear infection. I don't know if your vet has put your dog on antibiotics, but that might help clear it up.
The best thing to do is to take a cotton ball, put a little alcohol on it and thoroughly clean your dog's ear. You can use a q-tip if you can be very gentle. This helps get rid of any dirt or build up in the ear.
Then, I'm sure your vet has put your dog on ear ointments and/or drops. When you apply the ointment or ear drops after cleaning the ear, make sure the medication goes deep into the ear. Then rub your dog's ear. This helps get the medicine down into the ear canal. This is the best way to get the ear medications down in the ear.
Do this every day and the ear mites should go away. The longer a dog has ear mites the more likely it will develope into an infection. Clean your dog's ears daily. Then, when you put the ear ointments in your dog's ear, put it in a deep as possible, then massage the ears. You should feel a squishing when you massage the ears, which is good because you are getting the medication down into the ear canal. This helps a lot with getting rid of ear mites.
It's frustrating dealing with ear mites and even infections. Just remember to clean the ears daily then put in the ointments and massage the ears to get the medication as deep as possible in the ear canal.
Best of luck with your dog. Hope I helped.