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Hey there,
Sorry to hear about the trouble and the delayed response to your email.
When Ledger says “To add tokens, simply send them to your Polygon address,” it generally means that most tokens sent to your address should automatically be recognized and displayed in your Ledger Live account. However, this may not always be the case because Ledger Live does not support all of the tokens that exist on a given blockchain.
Regarding USDC on the Polygon network, it should work similarly, but if it’s not showing up, you might need to reach out to our support team and provide the transaction ID so that we can look into it.
As for the unwanted NFTs, it’s an issue many are facing due to the open nature of blockchain networks. Always exercise caution and avoid interacting with unknown or unsolicited tokens/NFTs. More on that here: https://support.ledger.com/hc/en-us/articles/6857182078749-How-to-handle-malicious-or-unknown-NFTs
Hope this helps clarify things a bit!