How to link new Steam account?

I wasn’t tradeable so I linked friends Steam account.
Now I want to unlink his account and link mine but after contacting the reply was “Unfortunately, we are unable to unlink a Steam account from a Gameflip account. This is for fraud prevention purposes.” and I got no further answers.
I can post all proofs that I’m the real owner of account.
Thank you!

Even if you have proof, that won’t change anything, linking Steam account is permanent.

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Oh… Okay

what happens if you delete your steam account??