I lost my BTC on CoinPayments.net they have exchange partner Changelly.
After several emails they say they do not give me the BTCs.
I tried to exchange BTC (0.00393854) approximated 30 USD and they say (CoinPayments.net and Changelly) that the value is less than the minimum value.
I received no warning to warn that the value was low.
I directly used the balance of my CoinPayments.net wallet and the convert button was visible.
Without the minimum value the convert button does not appear.
I simulated an exchange the next day and the minimum value was 0.000693 much smaller than the amount I wanted to exchange.
Changelly stopped responding to the email.

Luis