That is highly unusual. I have never heard of colloidal silver not working on an ear infection. What type are you using? Putting drops in your ears? How often? Several times a day? And how many days have you had the infection?
Perhaps this will help (from the remedies section of my website):
Ear Ache or Infection
l Colloidal silver, garlic, tea tree oil, olive oil and apple cider vinegar. Mix together three drops of tea tree oil with a two tablespoons of olive oil, a teaspoon of colloidal silver and a teaspoon of apple cider vinegar. Warm slightly and then lie on your side with your head on a towel (or paper towels) with the infected or aching ear facing up. Use an eyedropper to draw up the mixture and then slowly fill your ear to near the top. Continue to lie on your side for several minutes and the take the towel and hold it to your ear and lie on your other side and let the mixture drain out of your ear onto the towel or paper towels. Repeat two to four times daily. You should experience immediate relief and complete resolution within 24-48 hours. Note: If you do not have all of the ingredients, any combination will probably work. Also, oil of oregano can be substituted for the tea tree oil.
l Ease the pain and pressure of an ear infection with a store-bought blend of mullein (Verbascum densiflorum) and garlic (Allium sativum) infused oils. These oils kill pain and fight bacteria. Before bed, warm the drops. One way to do that is by placing the bottle in your armpit for 45 seconds. Tilt your head and squeeze 5 drops into the infected ear and then place a cotton ball in your ear for a few minutes to keep the drops from running out. You should experience immediate relief.
l Make garlic oil: chop one to two bulbs of fresh garlic. Place the garlic in a double boiler, and cover with an inch of olive oil. Cover the pot, and warm the oil gently over low heat for one hour. Strain the oil through a piece of cheesecloth, and store it in a covered glass jar in the refrigerator. To use the garlic oil, place a small amount in a metal spoon and heat it gently over a flame until warm. Suction the oil up into an ear dropper, place a couple of drops into each ear canal, and plug the canal with a soft cotton ball. Repeat this every hour or as needed. Do not use garlic oil to treat an external ear infection or if you suspect a punctured eardrum.
l Garlic, Apple Cider Vinegar, Honey, Eye Dropper, Warm Towel or Pad. Cut two to three cloves of garlic(fresh)into a bowl. Slice it very well so the juice comes out. Pour in about a teaspoon and a half of vinegar and melt in a little honey, not a lot (can heat it up warm if you prefer). Make sure you stir the substance up really well and then take take the eye dropper and draw up a little solution at a time and put it in the ear. Let it sit for about a few seconds and drain it out. After draining it a few times the ear should draw out and reduce the pain. Add a warm to mildly hot pad or towel.
l Another garlic oil remedy is to take garlic gel capsules and pierce the capsules to squeeze 4-6 drops in each ear. Garlic has a natural antibody called allicin. Repeat two to three times daily. Also take some of the capsules orally. You should see marked improvement in two to three hours and near complete resolution in 24 hours.
l Extract one teaspoon juice from mango leaves. Slightly warm and use as ear drops for ear infection.
l People that get a lot of ear infections might actually be allergic to dairy products, egg whites, wheat, peanuts or soy. Or, their intake of fatty foods may be too high.