I think we need to clarify what is actually happening here. You say that 'bailiffs' are after you, but from your account of things, this seems very unlikely. Your account of events suggests that the matter has not yet gone to court, which means the people contacting you, presumably just by post(?), are debt collectors, nothing more. Can you show us an example letter?
If it is debt collectors, don't engage with them, they are not interested in conversation, only payment.
What correspondence, if any, have you had directly with the parking company?