National town thalian road rawalpindi

Filmstar luckyali sold a 1 kanal plot to me in national town thalian road rawalpindi.All payments done plus development charges.Now instead on handing over the advertised land and delivering his huge promises he is asking to receive a plot i the non famous, uninhabited and far off national garden chakri road.What is the legal status of advertising and selling a land and actually forcefully suggesting to receive another?What should i do?