There is a simple process to revert the matter to the stage where you submitted representations.
While they try to intimidate you by saying they can register the debt at "the county court" and instruct bailiffs, the plain fact is that the "county court" is the Traffic Enforcement Centre, a special civil court with no court rooms and no judges. There is no possibility whatever of a CCJ, because the legal process was written to make sure these can never be issued.
Once the PCN debt is registered, they MUST send you an Order for Recovery. This adds £10 onto the Charge Certificate amount, being the TEC registration fee. They will include the form for submitting a Statutory Declaration that you submitted reps but received no letter of rejection.
Of course, you can phone the authority to tell them you have their acceptance response to your representations, and h have received no response. It's possible they may tell you they have responded, and give you the date of it. If so, this means, if they won't cancel the CC, that you must wait for the Order for Recovery as above. This could be weeks away. So once the period to pay the CC expires, check with TEC about every 10-14 days to see if the debt is registered. You may also be able to find out from the council website, as once they register the debt, the amount shown increases by £10. You don't have to wait for the paper OfR to turn up, you can download the SD form from the TEC website. You need a PE3
https://www.gov.uk/government/publications/form-pe3-challenge-an-unpaid-penalty-charge-notice