Plusnet still billing us for internet services which they no longer provide

[#1]

I appreciate that its the weekend, but I would like Plusnet Staff to give support ticket number 90120852 their attention as soon as is possible. I moved my internet from Plusnet to Sky on 28th July, but have just been sent a new invoice by Plusnet for advance internet services between 15/8 to 14/9, and I'm concerned as to why the automatic billing cycle appears to be continuing into a period where Plusnet services are no longer being provided.
Thanks in advance.

[#2]

Hi maureenandmalc,
I've had a word with our Billing team and they're waiting for the payment to clear before they calculate out your final fees. This will be worked out on Ticket: 89234310 on your account. Please wait to hear back from them. Sorry for any inconvenience caused.