Buyer increase his requirement on order page

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Hello A buyer come n contact me for blog page design with some 8 submenu so I did it than he said me to creeare ne more extra page so I did it too but now he again increase his requirement n saying for design more pages which was not in offer . Now when I says it was not in offer than he got angry n say bla bla n sending cancel request but I decline this . Now one more day is remIng for deadline of order so pleass suggest me what should I do ? Thanks