Leaving but still having to pay for a service I don't want/use?

[Dazz1]

I'm only 4 months into a pay monthly SIM, I don't use it and therefore will cancel it before 29/3/18, I rang 02 and enquired about it, they want £112...rip off merchant services. I'm not paying that so any ideas what I can do if any? 

[Bambino]

While you may think you're being clever, not paying what is relatively a small amount may come back to bite you somewhere down the road, but as others have said, it's your choice.

[Anonymous]

It’s your choice albeit not a good one but very much doubt you’ll be allowed to do it that way. It will be the full sum they ask for end of