Like most retailers, hospitals, ports and airports, there is an Estates department somewhere that either has hired the parking company - or knows who has.
First contact should be with the Estates to ask if they approved the company for the particular site. If they did not, ask them to tell you the name of the site's managing agents e.g Savilles or British Land
Address: Matalan Customer Care Team (0333 004 4444) Email is firstname.lastname@example.org
Smart Parking are Matalan's parking contractor and if you want to contact Smart about one of their parking charges then the contact details are: email@example.com. It is best to send a copy of your Matalan receipts with your challenge as Matalan will instruct Smart to cancel for genuine customers.