Invoice Changes midstream

<p>We booked a Fidic Course with Maine Consulting and they Invoiced us a value. Later in the day they re-invoice us with a different value saying that they had cancellations (not linked to us at all) and have distributed the costs of the cancellation among the people who are attending the course.</p> <p>How is is right to quote someone one value and then feel it acceptable to change it midstream. It is unprovessional.</p> <p>We certainly won't use them again.</p>