New contract issues

[#1]

i signed up to new contract special offer price from 16/5/2018 to a lower price of £36.99 for 18 months  just checked my bill and i have payed £39.97 can someone tell me why this is please?

[#2]

Hi Andy, it looks like an issue with how the new contract was applied so apologies for that. I've added an update on to your account with the specifics, here's a link to it: https://www.plus.net/wizard/?p=view_question&id=176810915 

Adam