But you called!!! If you called it means you already had a reservation in your communication. Else the restaurant would not have prep food for the exact amount of people!!!

If you called to ask if they could have 25 people to sit, and they said yes. Then thats the end of call and this would not happen. The dumb ass company sure must have told them to reserve place for 25 pax "IN CASE THEY COME OVER". You can't do this!!! Its very irresponsible. The restauranter might not have caught your scheming words.