You have 28 days from receipt of a postal PCN to submit representations, or pay. You state you work away from home, so please tell us more, because a CC can only be paid, not appealed. After the CC the council register the debt at the Traffic Enforcement Centre, (a 'court'without any court rooms !). This adds £10 to the CC amount. At this stage you can submit a Statutory Declaration that you didn't receive the PCN, but we need your story because we don't want you to tell porkies on your SD.
So, please give more info.....