To bring the case within the scope of estoppel as defined in section ] I 5 of the Evidence Act: t I ) there must be a representation by a person or his authorised agent to another in any form a declaration, act or omission; (2) the representation must have been of the existence of a fact and not of promises de futuro or intention which might or might not be enforceable in contract; (3) the representation must have been meant to be relied upon; (4) there must have been belief on the part of the other party in its truth; (5) there must have been action on the faith of that declaration, act or omission, that is to say, the declaration, act or omission must have actually caused another to act on the faith of it, and to alter his former position to his prejudice or detriment; (6) the misrepresentation or conduct or omission must have been the proximate cause of leading the other party to act to his prejudice; (7) the person claiming the benefit of an estoppel must show that he was not aware of the true state of things.