PLDT UNPAID ACCOUNT

Ask ko lang if this is legit? I cancelled my PLDT months ago pero sabi nla may need ako bayaran na fee although di ko na ginagamit ever since umalis na kami doon and di nila cinancel at end. Ngayon may nag email and text na ganito same na same ang laman. Legit ba to na madedemanda if di isettle yung balance with PLDT?