GST on service

honey (student) (53 Points)

18 February 2020  
I am a service provider. I provide the services of cargo transfer on behalf of my customers. I give my bill to customers after charging 18% gst.

But i have one problem. The truck in which cargo is transferred, that truck company gives the bill of transfer on my name after charging 5% gst.

I then give two bills to my customer one of service at 18% and other is of transport charges at 5%

is this correct?
if not tell me the correct treatment