Is there a usb c dock with USB and thunderbolt 2 connectors?
I am basing my answer off this statement in your question: 


  I need at least 1x USB and 1x Thunderbolt (for external Monitor)


What you need is a USB-C Multi Port Adapter with Power Delivery.  This will connect via the USB-C port, give you an HDMI port for video, USB 3.0 ports for expansion and another USB-C port for charging.

As far as the adapter that you previously bought is concerned, you bought a "Thunderbolt 2/3 converter."  What you needed was a Thunderbolt or USB to display (HDMI, DispayPort, VGA, etc.)

It's important to note that the ports on your MacBook are Thunderbolt 3 ports with USB-C connectors.  USB-C is the physical specification of the port while Thunderbolt is the protocol.