If you have recently joined or recontracted with BT ( so the last few years ) then you pay for broadband and that can be a standalone service, if you take a telephone calls package then that’s shown on the bill as a calls package, not landline .
What is it you think you shouldn’t have to pay for ? , as stated if you have a telephone calls package but don’t want a phone service at all ( that also means getting rid of your phone number , so no incoming calls as well as not being able to make outgoing calls , including 999 type calls ) , then you purchase or switch to a broadband only service, that will save the cost of the calls package .
As you haven’t stated what calls package you have , obviously we can’t know what you would save , if you have PAYG calls , then the saving typically will be £2-£5 a month ( depending on what price you negotiated at the time for PAYG ) , it shows this on your bill
