Trying to update meter readings, but new reading below original

Joined recently and must have given a wrong reading by one digit

I’ve tried updating the reading and showing visual proof, but keep getting emails about you have never had reading from me. and obviously being overcharged as this happens

Cant find a direct email to contact to send the picture to and explain pic (I live in house with 20 flats, are meters are behind doors, but caretaker puts readings up on form every month, I have picture of that)