DCBL can be ignored, but this will progress to a Letter of Claim and a county court claim from DCB Legal which can’t.
In due course you will need to defend this in court. If defended, DCB Legal usually discontinues at the last moment.
In order to defend, you may need the original Parking Charge Notice. If you don’t have this, you may want to request it via a Subject Access Request to the parking company (Parking Eye, not DCBL).