You mentioned amoxicillin 500mg. The "augmentin" and "clavamox" you are being told will work are BRAND names of a drug combo called "Amoxicillin Clavulanate" and a common size of it 500mg/125mg, which means it is a single pill that combines 500mg of Amoxicillin and 125mg Clavulanate. We have seen many people looking for meds when they had exactly what they needed in hand, and simply saw the "Amoxicillin" part and didn't pay attention to the rest of the name. Can you double check the label on the pill bottle?