不届 ふとど せん まんではありませんでした
futodokisemmandewārimasendeshita

Noun
Desu Copula
na-Adjective

The polite, past negative form of 不届き千万

1. It was certainly not the case that I did not reach [you/him/her].; It was absolutely not that I failed to get in touch.

Past/Perfective
Negative
Polite
Formal Register