user130755: New to bitcoin and I use their support Bitcoin wallet address instead of using my wallet. How do I get those funds back?

user13866: 
I use their support Bitcoin wallet address instead of using my wallet

Tell them you sent them money by mistake, mention the transaction ID, and ask them to send you the same amount back (less transaction fees).
How you do this depends on who they are (and whether you know who they are).
Since there are no Bitcoin police and no-one in charge of Bitcoin, you will likely have to rely on the goodwill of the recipient.

130755: <p>New to bitcoin and I use their support Bitcoin wallet address instead of using my wallet. How do I get those funds back?</p>
 13866: <blockquote>
<p><strong>I use their support Bitcoin wallet address instead of using my wallet</strong></p>
</blockquote>
<p>Tell <em>them</em> you sent <em>them</em> money by mistake, mention the transaction ID, and ask <em>them</em> to send you the same amount back (less transaction fees).</p>
<p>How you do this depends on who <em>they</em> are (and whether you know who <em>they</em> are).</p>
<p>Since there are no Bitcoin police and no-one in charge of Bitcoin, you will likely have to rely on the goodwill of <em>the recipient</em>.</p>
