Background: Last financial year, I made some voluntary National Insurance contributions to enhance my future State Pension. HMRC's acknowledgement email said I'd be contacted about it, but gave no date or timescale.
At about 8 am on Bank Holiday Monday, my phone rang. The caller claimed to be from HMRC and said they needed more information; they wanted my NI number and date of birth. First, I used the online Government Gateway when I paid, so all my details are already on the system. Secondly, I'm not gullible enough to give out my personal or financial information over the phone just because someone asks for it. The caller mentioned I could call them, 'HMRC', back on the same number if I felt more comfortable doing that. I phoned the number later that day, and it just went to a recorded message saying that no one was available to take my call.
AIBU to think this is probably a scam and that I should report it to the real HMRC? Or is it normal for HMRC to call people early on Bank Holidays and ask for sensitive information over the phone?