Used stamps exchanges.

This is one of the worst lots I received since I am a member in this club.
This is unrespectful and a shame for every stamp collector.

if I'm not mistaken, this person has multiple accounts here

I'm sorry about what happened.
It was not intended to be his worst receipt and not even discourage a collector.
I'm ashamed about that.
How can I fix this error?

There is nothing to fix and there is no error.
Just send stamps, that another one maybe can use, and no trash!
You can do better, for example in BR-420.
For this time I will update to 3, but only because you sent a message, not because of your stamps!
Best regards, Wolfgang.

OK. Understood. Alles Gute