@mofturici2005 Here's how to leave, if you're unhappy: https://community.o2.co.uk/t5/How-to-Guides/Cancelling-Your-Contract-A-Guide/ba-p/566774
well you do, given your statement, make me wonder why you have stayed for five years if you think it's expensive. We here have no access to your account so can't see what you are paying each month.
Are you also saying that coverage is poor? If so, is this something that has always been poor or has it suddenly deteriorated?
Check your postcode here :