Billed incorrectly this month

[#1]

I have tried to get through on the phones, waited for over 40 minutes twice and haven't managed to get to someone.

So though i would post here.

I renewed my long standing contract for another 12 months at the end of March.

I am supposed to be billed £21 a month.

I just got my bill for this month and it is over £50.

Something must have gone wrong. I need this to be explained please.

I've attached an image of my latest bill here, as well as the two emails i recieved showing references and what i was told i would be charged for the next 12 months. Please excuse the two replies i made to this post. Attaching multiple images to one post is not obvious.

[#2]

Attached an image of one of the emails i recieved showing what i should be billed.

[#3]

Attached a second image of the other email i recieved at the end of march showing what i should be billed for the next 12 months. (I can't see a way to attach multiple images to one post).