Syska Gadget Secure — power bank not working

Address:

Mumbai City, Maharashtra, 401203

Respected Team,

I have bought a power bank from Amazon on 5th October, 2017 which is delivered on 10th October, 2017 please find below product details

Order number :[protected]
Invoice Number : HYD[protected]
Invoice Details : TG-HYD[protected]
Product Discription : Syska X110 11000mAH Power Bank (White-Blue) |
B01LAWYAHU ( B01LAWYAHU ) HSN:8504

Now it's not working properly, I was searching for service center in Mumbai but there is no proper address, I have tried to contact amazon and syska customer but amazon doesn't have any information of service center as well as they don't have any contact number of syska customer care, I got syska customer care number[protected] but from last 5 to 7 days that phone continue bessy
and some time said we are sorry and disconnected.

Request you to please find easy way to get good service and support from the supplier of the product