Charged £50 for line set up?

[#1]

I signed up yesterday. I have been trying to get through to customer service, but keep getting passed around and then cut off.
I signed up to a broadband package last night. I noticed I have been charged £50 for line set up. I already have a phone line, so does anybody know why I am being charged?
Not only that, but looking in terms and conditions it says a broadband set up is £25 and fibre is £50, so even if my phone line does need "setting up", surely I should only be charged £25?
I would appreciate any help you guys can offer!

[#2]

There's no active phone line at your property which is why you were charged £49.99.
We do state this on our website and during the sign up process.
'If you need a new phone line installed at your property there's a £49.99 installation charge (excluding external construction charges).'

[#3]

Ah so is the £25 and £50 for activation a separate charge to the new line installation?

[#4]

Yes but because you've took a phone line with us you won't be charged those fees.

[#5]

Cool, thanks for your help! Any chance you could get one of the engineers to sort my broadband today or tomorrow?  can't wait to get it set up!
Have a great day!