My 2 cents:

1) It is not humiliating you Hilmi because you WERE drunk. Its proper facts, evidenced by your friend's reply that you were drunk. Hence it is not humiliating because it is part of TS's side of the story.
2) a personal warranty should not be treated as if it were nothing. a warranty is a warranty.
3) I do agree with you on the refund part, as when a seller lets a buyer test something, and the buyer takes it home, it is reasonable for the seller to be skeptical if there is any problem complained by the buyer after taking it home - thats why theres a warranty, a guarantee.
4) Probably a full refund is not needed but a 50% refund should suffice OR let the buyer provide a receipt of the repairs and you pay half, he pay half.

I already offered TS to refund his money if I needed to. So what is still the issue here? All im asking is for him to remove my details. That's it. U do that, money is yours.