I need to write complaint to paypal about one transcation(i sended from one paypal account to another,and then got chargeback)What should i write?

No response yet?Weird.

just do open case on resolution center.

I just did that.Btw how long other party have days to respond?If he dont respond will that automaticly return money?

If he does not response, paypal will return your money in case he still have enough in his account. Otherwise, you can only get partial amount.