Adding call package - product changer prices differ from expected

[#1]

I recently switched to Plusnet and now want to add the £8 Unlimited UK & Mobile calls phone package to my account, so I went to product change in the member centre to do this but the prices didn't add up so I didn't finish it.

I'm currently on line rental and Unlimited Fibre broadband.
The broadband package being 12 months at £12.01 increasing to £19.99 after 12 months.

The issue is the product changer shows my broadband to be £19.99 both on my current package and on the new package and so gives me a new monthly price of £45.98 when I was expecting it to show £38.

I obviously don't want to add the phone package if that is then going to screw up my broadband price discount.

Is it just a case of the product changer being wrong in what it shows with the broadband prices or will adding the call package actually change my broadband package price as well?

[#2]

The product change tool doesn't show any current discounts you have which is why it shows as £19.99.

You'll keep the discounts you have in place if you choose to change the call plan package

[#3]

Thank you, that sorts that out

Another question now, I signed up via quidco, will changing the call plan or taking out value line rental saver interfere with quidco paying out?

[#4]

Upgrading your call plan and adding LRS shouldn't affect that.