OnePlus India — one plus 5 8gb ram and 128gb storage

Address:

Dehradun, Uttarakhand, 248001

I bought this phone through amazon on line services. The phone has two fault of which i have become aware of. One is what's app can be stalled and works for couple of minutes but after that it stops sending and receiving messages although the icon stays. I have installed and installed what's app messenger many times with the same result.
Second is when listening to songs recorded via wynk music when from my play lost i press play all the first song comes okay but after that it does not play songs sequence wise but missed some songs and after some time lapse plays another of down the line but does play sequence wise
What is the remedy. I am from dehra dun uttarakhand and there are no service center.
My e mail is [protected]@yahoo.co.in

Thanks
Dev mall