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.

To Hilmi, then you shouldnt have provided a personal warranty. If you INSIST that the fault came from the buyer and therefore cant claim warranty, how else can he claim that 3-day personal warranty?
isnt it the way a buyer claims warranty? its usually the buyers fault (but not on purpose of course) which causes the item to become faulty and then claim warranty. thats why people always extend warranty on new items.


I cant say for sure if this is a con case because there isnt any actual evidence which tells me when the item got faulty.

but this is a case of non-professional etiquette by the Seller.

true... agreed. the best way is to go to a Behringer store and ask the technician there to check it.