This a bit unbelievable. Even a village girl or her parents do not perform the marriage without looking at the groom in advance. Even assuming that they did not make such an effort believing the mediator words, atleast on the marriage day on the dias the bride will have to see the groom. Without that the marriage cannot be completed in any religion. Therefore, the bride and groom seen each other only on the first night is unbelievable. Leaving the arguments and assumptions aside, if this is true, since the marriage is already performed, the only remedy is to get divorce through a court of law, for which the bride will have to establish that she was cheated by the mediater. Simultaneously criminal case can be registered against the mediator and the groom for cheating. It also amounts to rape if there was any conjugation between the two.