Dear Customer, our apologies for the unpleasure experience. Please, provide us your changelly transaction id, we will investigate what happened! Just notifying you that network commission does't included to the estimated amount. But is always showing on the confirmation page before payment. As for rates, we never promise the fix rates, but do guarantee that your coins were exchanged at the best available rate, once we received confirmation of your payment in blockchain. If we are experiencing issues with our exchange partners, we are always notifying you about possibility of the delays before payment. Hope that make sense!