Why won't calls go through the Bluetooth on my car?

I bought a new phone end of last year and it's on Android 6.0.1. Since having it, my phone will connect to my car via Bluetooth and play music and navigation though it but it won't do calls. If I try and call through the car, it doesn't find a phone (but music will still play) and if I call through the phone, it just comes through the speakers on the phone (although the music from my phone going through the car pauses). I've looked at the settings on my phone and when I look at the paired devices and go on the settings for my car, the only option to be ticked is 'Media Audio', there is no 'Call Audio', which is what I would expect to see as an option.

Before this phone I had an android phone, I think on whatever the latest update was for 5.0, and never had any issues. The new phone has never worked with regards to calls.

Any help would be appreciated.

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