Apple India — faulty battery replacement

Address: DLF Cyberhub, Gurugram, Gurgaon, Haryana, 122002

Got my phone's battery replaced at Apple service center. Its not been 8 complete months and its already at 72% capacity. Clearly Apple replaced and provided a faulty battery in replacement and charged me for it. The battery which I got replaced was at 84% capacity after using it for more than 2 years.
Apple claims the battery to remain at least at 80% capacity after 500-1000 charge cycles. They have committed fraud by providing a used/faulty battery in replacement.