However, regardless of whether or not you have obtained a written agreement, if you have a complaint about any of the work carried out, you should send a letter of complaint if you've not been able to resolve the situation verbally.
A written complaint is evidence that you were dissatisfied with the workmanship should the matter later come to court and also lets the tradesman know that you intend to take further action if it's not resolved soon. It always helps if you withhold partial payment of a job too until it's been satisfactorily completed and most reputable tradesman will agree to this, especially if it's a large job.
However, be aware of your rights. There are numerous Acts of Parliament that are there to help you if you feel that you have not received the quality of work you had agreed to and paid, or partially paid for, so always know your rights and be prepared to use them and to let people who have provided you with a service that you intend to use them, if the matter isn't resolved. Your awareness of your rights alongside the implication that you would be prepared to exercise them is usually a good way of getting the resolution you desire far more quickly.
Your letter should be firm but polite. Where necessary, you should refer to the written agreement (or the verbal one, if that's all you have), pointing out any discrepancies between the agreement and your interpretation of the work provided. Your letter should be polite but firm and you should point out your grievances as well as stating what you want the person responsible to do in order to rectify the situation.
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