sure people read methods of withdraw at least, mate
sorry to say this but you completely fucked yourself, it's your fault only...
on the other hand now you have the chance to actually read something and try to get your money back with those items you said they give you. do some research and try to find sites that give money for DOTA items, or exchange DOTA items with csgo items so you can later sell those and get at least some of your money back.
wish you all the luck although...I hate betting on a personal level...still, hope you will manage this situation with a positive outcome.