The people who lived in our house before us were a bunch of chinese people. One of them keeps receiving letters from some random company claiming he owes them money. We ignored the letters for ages, but they kept coming so we thought we'd have a look, anyway it was along the lines of 'you owe us £4k' - and a date for which to have replied/started repaying. The following letters were all the same, saying 'you owe us £4k' and moving the deadline back and back, but eventually threatening legal action. Another letter came from the company. They are willing to settle for £600.