This will be a claim issued by DCB Legal and it will be signed by David Croot. All I need to know is the issue date of the claim.
I can guarantee, with greater than 99.9% certainty, that if you follow the advice you receive here, you will not be paying a penny to (not so) Smart Parking. So, give me the date of issue of the claim and I will advise you on exactly how you defend this against this claim.
Also, it was a dumb move to use DCB Legal's online portal. All you had to do in response to their LoC was send an email. If you start to receive texts or calls from DCB Legal, DO NOT respond tot hem. Just block their number from your phone.