Hello.  I bought a bitcoin from a  exchange and the  exchang sent me the bitcoins on a payment gateway.  How do I transfer them to my wallet?  He does not answer me. I do not know why he sent me on the payment gateway.  He did not send it to my wallet.  Now I'm not at all confused.  I have to work with a programming team.  They do not know either.  The exchange said you should use Bitcoin Mixer.
 please help