May be high. I pay basic BT line rental plus £5 per month to Skytalk which gives 24/7 free calls within UK plus Europe and USA Canada Australia NZ etc
Broadband I pay Madasafish (Plusnet) £7.99 per month on 12 month contract allowing 5Gb per month with £2 per additional Gb
If you are unhappy with what is happening ask for your complaint to be escalated to a senior official for consideration
I'm a great believer in having my line rental with BT for prompt service if the line goes down. But I live in a remote rural area where faults may happen more often.
Many AOL/TalkTalk folk complain that the accounts since the merger do not do the business for them. If you are unhappy make sure you keep records of all letters