If this letter doesn't do the job then your solicitors will begin to recover the debt through the courts. This will involve a process of letters and formal court proceedings until a judge can finally pass a judgement. As soon as legal proceedings are initiated by your debt recovery solicitors, the amount of money that is owed will begin to change. As soon as the legal process begins, the person or company who owes you money will also be liable for interest on the full amount owed, and the cost of legal proceedings.