Won't Charge 2months After Buying

Initially really liked these earbuds. The volume didn't get very loud, but they stayed in during exercise and the battery life was FANTASTIC. However, after two months of using them, the left earbud will no longer charge. I don't know if that's usual for a product like this to only last 2 months but if I'm going to spend ~$40 on an item, I would've liked it to last longer.

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