Parts Big Boss — car drive shaft replacement/refund for damaged part not completed

Website:

www.partsbigboss.in

Ordered and paid online through paytm 11780 to parts big boss. The item was damaged, after many deliberations the company agreed to replace the goods. Which was collected by fedex on 9th of june 2018.
The company has neither provided dispatch details of replacement not have confirmed refund of the item even after 15 days of collecting the defective part supplied.
Presently calls to the company only states that head of the department mr ankit tyagi will be getting in touch with me. No calls or emails from him or the company for the last 7 days.