If you have broadband you haven’t paid separate ‘line rental’ for years ( probably a decade or more ) , your broadband ‘fee’ includes ‘line rental’ , its one figure on the bill , not arbitrarily subdivided into broadband and LR.
Historically, line rental cost was inflated to make broadband look cheaper than it actually was , when wholesale line rental was £7 ( that’s what Openreach get ) typically ISP would say LR=£20 , so they could say on a bill of £25 , ‘our broadband is the cheapest out there at £5’ , they had the margin between £7 and £20 to play with , that’s why ( in large part ) Ofcom dictates that the headline price is advertised, for example £25 , and not some misleading breakdown into two parts of £20 and £5 , that are not even reflective of the true cost.
As FTTP becomes ubiquitous, and copper becomes less and less , the only regulated network provider Openreach may be pressed by Ofcom, as it is already , to justify any wholesale price increases, basically if OR want to put prices up , they have to show increased input costs …retailers are not regulated, they leave that to the market , if you don’t like one service providers price there are literally hundreds to chose from
Ofcom gave OR a little leeway with FTTP prices , after all , why invest £25 billion, if Ofcom say you are not allowed to actually make a profit, any new infrastructure needs to be paid for , and if a return on investment isn’t allowed, why make the investment in the first place
FYI, the mean time ( average ) failure on a copper line is 9 years , I have lived in my current house for 30 years and have had 1 fault that needed Openreach attention, so you have been unlucky, if your address needed constant attention, perhaps that areas fault liability is one reason why you have FTTP
