The telephone number +49 208 2356418 is being used as part of a campaign by scammers to rip off residents of the United Kingdom.
The tactic on this occasion is for the scammer to pretend to HMRC workers calling to inform the recipient that they are being investigated for fraud. Given the fact that the phone number this call is made from has the German phone prefix +49 should be a good clue that this call is not legitimate. Further evidence is provided by the fact that calls from the number +49 208 2356418 consist of a threatening automated message.
In fact what the scammers wish to do is to convince the recipient to press one of their automated options. In doing so the potential victim will be connected directly to a scammer. They will then try to extract perosnal and banking information for teh purposes of fraud. Avoid any intereraction with this number. Delete. Block. Report.