Being billed too much for wrong service

[#1]

So I joined Plusnet a month ago and just got notification of my first bill and being more money than it should.

You can see my previous problem joining Plusnet and all the hassle in this thread 
TLDR - Couldn't get Unlimited Fibre Broadband so was downgraded to Unlimited Broadband which is £5 cheaper (£18.99) and supposed to get discount applied to next bill.

Several issues with this bill
1. It says Unlimited Fibre Broadband £28.20
2. No £5 discount applied
3. No good will gesture for the 4.5 days without internet

If the bill was correct it would be
Unlimited Broadband £21.72 (due to 14.4% increase) - £5 over pay of first month = £16.72 ish

Can someone please fix this mistake.

[#2]

HI @AJ_777, I'm sorry to see that your billing/products are wrong. Can you respond to this ticket for me please? Once you've done that drop me a message on this thread and I'll be able to get it all sorted out for you. 

[#3]

I've responded to ticket.

[#4]

Brilliant!

I've put through the product change and also sent across an email to let you know everything that has been done and what you expect to see moving forward. You will have received an email that quotes the service being charged at full price, please ignore this as the discounts will be applied.