bustard took advantage of me

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I am good at fixing computer.And I always help others for free.But a guy in my apartment who is doing computer bussiness always ask me to solve the problems which caused by the computer he sold.And I got nothing from him besides getting annoyed.If I turn my back on him,maybe I will get misunderstand by others.Can you gime some suggetions to keep that jerk bustard guy at bay?