Charged for calls which didnt connect

hello
iv recharged my EQO account today.. tried making calls to my friends in the US.. after placing an EQO OUT CALL i got a call back as usual.. but i could hear nothing.. just blank.. came back to check my balance. amounts been deducted. thought it was some problem with the othr persons phone.. i made a couple of calls faced the same problem.. could u plz check what the problem is. and redeem my credit.. and plz tell me what the problem is. as theres nothing wrong with my settings as i made calls with the startup bonus i got. plz check out and fix the problem asap !!