Cant cancel a policy

Been trying to cancel home content insurance for months via the app which is simply impossible as they just don’t ****ing cancel it, I work mostly nightshift so I don’t want to ****** speak to anyone as I am either trying to sleep or at work. I literally just want to cancel the home contents insurance as since we moved my wife already has a policy in place. I want to keep my other policies such as my wives ring and the accident policy, just want to cancel the normal home contents. How difficult can it be