Lancet up to Dirty tricks again

Did not receive any account/statement from Lancet for 8 months, then receive threatening phone calls and letters saying if I don't pay immediately they will hand me over. Yet two other accounts received by me at the same time (8 months ago) were paid within 3 to 4 days of receiving the account. Their accounts depart is obviously still in a shambles. Had similar problem with Lancet approximately 10 years ago. Don't go to Lancet for blood test!