I submitted this enquiry on 14-10-24, but have had no reply and cannot see the thread online. I have a TC3MM letter dated 11-10-24 about tax credits for the tax year 2012-13. This long after then, I'm concerned this may be a scam? If not, why would I receive such a letter without any prompt from me please? An amount of nearly £4,000 is mentioned - I can't tell if this refers to what I have been previously paid or if it is an amount which may be due to me. I have tried to find out about this by calling 0345 300 3900 but gave up after being on hold for a very long time. Will appreciate any advice/guidance please.