Reservation Number *** not honoured

My husband booked a vehicle online through EuropCar and we got the confirmation via email with the reservation number as well the amount to be paid. This was done on the 14th of August 2017 for our travelling planned for the 22nd of September 2017. On the 21st of September 2017 after lunch time, EuropCar called to say there are 2 bookings under my husband's name, one with Avanza and one with H1. My husband told them that he knows of only 1 booking, the one of Hyundai H1. Then the lady advised that she was calling to let us know that the H1 we booked is not available anymore. Why they didn't say this at first when they called because it seems as if they were playing tricks by telling a story of two bookings that doesn't exist. How can we book for more than a month ago only to be told last minute. This is not right at all levels, how are we suppose to get a 7 seater within hours for the travelling we planned long time ago. So disappointed with the service provided.