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When I was working retail in a technical environment I had a customer come in wanting to buy product X. Since I’ve always just wanted to help people I suggested product Y for its superior quality and longevity at a slightly higher cost. The customer started raging at me how dare I try to upsell him something he didn’t ask for. Other customers turning their head and all. He left fuming saying he’d go to another store.
A day later said customer came back into the store and I was already bracing myself. Turns out he compared the products on the website and read some reviews and realized I was right. He apologized and bought the product.
It was not really satisfying, just turning a negative into a neutral I guess.
They didn't have to come back and tell you you were right; could have just bought it elsewhere and avoided you (out of shame for their own ignorance) so I consider that a win at your end. You can totally own that!