If you haven’t changed your service provider for a while ( 2 years ) you will probably notice your bill rising.
You could save money by switching your Service Provider but this is a lot of hassle. An easier way to go about it is to call your them and threaten to change S P unless your bills are reduced .
They will do anything to keep your direct debit going . As long as they can keep helping them selves to your money they will. Even if it means putting you on the latest cheapest deal.
Don’t assume switching back to "good old BT" is going to be any better, they are one of the worst for upping your bill every year.
I met an old dear living alone who was paying BT £475 / year for phone and BB and a load of other stuff she didn’t know anything about. You should be able to get both for £260 / year. Beware low (10gig) data limits this fine if you are an old dear living alone but not for the techno family watching you tube every night.