On [date] I was disturbed by unacceptable levels of noise in the form of [describe] coming from your house.
Despite asking you previously to reduce the level of noise, it has continued. This is causing [effect on you]. This has now occurred on [number] occasions over the past [period of time] which I have informed you about previously.
As this is a constant occurrence and you appear not to have taken my complaints seriously, I am writing to let you know that I am unable to tolerate any further disturbance.
If I am disturbed by [the nuisance] again, I will have no alternative but to contact the council to request them to take action.
In addition, I may take action against you for compensation in court, and will apply for an injunction restraining you from making a similar amount of noise in the future.