Transaction shouldn't broadcast if you do not confirm from your device. So during payment process did you noticed the amount and address? Had you checked on block explorer if all the amount has sent to the same address from where you bought voucher? If your wallet synchronized correctly then transaction details should be there either balance should be there. Please share more details including transaction details. Perhaps you would notice any suspicious transaction on history.

By the way, if transaction has been broadcasted on the blockchain and at least there is 1 confirmation then your fund has gone. Bitcoin is irreversible and couldn't be refund with any cost. Don't fall into second scam in order to recover your funds.