Why do my headphones make calls instead of untethering?

I have the Cowin E7 Active Noise Cancelling Bluetooth headphones, and whenever I hold the play/pause button for about 2 sec, it usually untethers from the currently connected device so I can connect via another device.

Example: I am connected to my PC with my Bluetooth headset, but I want to listen to something on my phone. Instead of turning off Bluetooth on PC, I can hold the button and it will be available for connection again.

This usually functioned from PC to phone and opposite, but now it only functions when I try and untether from PC. When the headphones are connected to my phone, whenever I hold the button for 2 sec, it calls my girlfriend instead... Please help!

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