Cristen-Dex LLP Commercial Debt Recovery Agents. Cristen-Dex LLP has over 25 years of experience in providing a broad range of debt collection services and solutions to our clients all across the UK. We specialise in business to business debt. We recognise that our clients will require a service tailored to their own needs. These will be discussed fully at the outset. Along with pursuing debts through our comprehensive collection techniques, we can offer pre-litigation and legal services. For a free consultation or to discuss our process in more depth, please feel free to get in contact with one of our experienced Credit Managers who will discuss what we can do for you.