The admin from the website payexchanger.com have send me my webmoney back.
But i have a bad feeling still, because of the lie, he did writed that paypal payment have been done and it was not really done.
i have a bad feeling because the website offers low fees for exchange, which looks like only for fishing people and not be real.
I would recommend to use a registered webmoney exchanger or if you want to try this exchanger then really just with small amounts. but i will not use this exchanger again, after i have see what have happened, that is complete unprofessional to tell a payment was done and it was not really done.