Contract renewal time and its gone t*ts up already

[#1]

So my contract/ minimum term comes to an end this coming Monday (16th Aug) and as per usual ive done a little shopping around

Plusnet offered me £21.95/month inc line rental (for vdsl 40/10) in an email :

Our best price for you

Unlimited Fibre broadband and line rental for just £21.95 a month. 18 month contract. Price changes apply.

and

"

£0.73^°a month 18 month contract The price above excludes line rental. The cost of your broadband and line rental will be £21.95 a month when your Line Rental Saver expires on 10th September 2022"

click through to renew and "Sorry, the offer you selected doesn't apply."

plus theres an oddity on my last bill as well, with a few double entrys?

 Plusnet Anytime £1.81
Plusnet Anytime £6.48
Voicemail £0.00
Caller Display £0.00
Line Rental £0.00
Line Rental £0.00
Unlimited Fibre £3.61
Unlimited Fibre £13.15

[#2]

Good afternoon @pint

Thanks for reaching out. This is a pro rata bill, as it covers you from 10/08/2021 - 10/09/2021, whereas your contracted discounts will only apply to the 16th of this month. I can't really offer much assistance with the new contract I'm afraid, but feel free to give our Customer Options Team a call on 0800 013 2632 and I'm sure they'll be able to help with this.