DANGEROUS SCAM - do NOT answer, Do NOT press 1, Do NOT call them back, You will NOT face any legal consequences for ignoring their obnoxious scary messages. They pretend to be officers from HMRC threatening you with immediate arrest for non-existent unpaid taxes unless they get an instant payment! They're persuasive, Aggressive criminals using fear tactics to extort money from vulnerable people and have already claimed a number of elderly victims.
This is a scam! Did not answer but a recorded voicemail from the National security department (hmmm) was left saying I was under serious fraud investigation and to call them back otherwise my national insurance number would be frozen! Also told me to have a blessed day
Total scam!