Thank you all for your help. Is there any way to find out what (if any) debt I owe?

Hi, just received this sms out of the blue from CDER Group. No idea what it is for and no idea what to do. Any advice/help would be greatly appreciated: "DO NOT IGNORE THIS MESSAGE. An Enforcement Agent may be allocated to your account and your goods may be removed. You can pay now using this link: https://customer.cdergroup.co.uk/portal/paylink/******** or contact CDER Gruop on 0330 107 0023, Ref ******** Security code. If anyone in your home has symptoms of COVID-19, is self-isolating or has been advised to shield, please contact us on 03301070023 before we visit you at home" As I said, it came out of the blue. I don't think it is a spam message looking on forums, I don't want to call them as they will ask for phone number and address, so how can I find out what debt I owe? Many thanks