Just as a data point I changed a partner award two minutes ago and was not assessed any charges for this, in case anyone still is concerned about existing bookings.
Gold phone number to quickly get through to an agent to charge you a service fee and change/cancellation fees.
Comedy Gold
But that's how nearly all Software developers for the corporate sector work... we sell you a licence to use "our" software, we then charge you 25% maintenance, and hundreds of pounds an hour to teach you how to use it, and then for the consultants and project managers to analyse the customisations, then developers, then more training etc etc...