The Scammmer Karim123 needs a ban

No calling out. Just report him to support.

Report him to the support with evidence, and remove the name / close the topic because you're also breaking the rules (the no calling out = no shame or name one)

You maybe should read the guidelines of SG:
https://www.steamgifts.com/about/guidelines

Especially this part:

• Use the appropriate avenues for support. If you have an issue with another user, submit a ticket with a user report, rather than calling them out within the community or on the forum.

He lost a giveaway slot and will have to work pretty hard to get it back. He will also have a not received on his profile as long as he is here. Also, not like any actual value was lost, nor any real game at stake here.