PORT SUBMISSION >> LOSING PROVIDER/CARRIER VERIFICATION (PNV) >> DANGER ZONE (DO NOT CONTACT YOUR CARRIER) >> PORT ACCEPTED OR REJECTED >> CUT-OVER TO (IF ACCEPTED)
Cat C Rejection fees will only apply if the number port gets rejected by the losing carrier as a result of one of your actions with the losing carrier after submitting the port, for example if you ask the carrier to disconnect, add or remove, or otherwise change the service (or any other service on the same account) that you are porting. A list of some of the common rejection reasons are here.
The best way to prevent a CAT C port rejection is not to communicate with the losing carrier for the entire duration of the port. Make sure all account-holders and authorised contacts are aware, as you agree to pay the rejection charges in full by continuing with the porting application.