The certificado de habitacion should have been issued prior to the electric and water being connected.
This is the definition of the certificate
Cédula de habitabilidad (Certificate of habitability): A certificate certifying that a property can be lived in, which is issued when a building conforms with the building standards and codes. It must be issued before the electricity can be connected or a gas contract signed
The next bit is taken from the Round Town News
Quote:
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5) The sale of property that does not have a certificate of occupancy (certificado de habitación) or licence of first occupation, which may be due to the fact it has not been constructed with the necessary permissions and is not recognised by the local authorities).
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RTN Costa Blancas Free Newspaper - Round Town News - Everyday Spain with Tina
Looks like you might have to contact your solicitor or an abogado
certificado de habitacion 
