InFocus — misbehave by an employee of infocus

Sir i want to tell you that infocus chandigarh mobile service center's employees are not good people. On 28 aug when i went there to brought a battery for my infocus phone an employee named viney try to make some money from me. He asked for lot extra money than the mrp including 28% gst for his own and when i said i will not give more money than he said they don't have any batteries available and he will not give me one.