2007 Volvo VN 780 Clutch

I think you need a new clutch... Shut the engine off put it in low gear and float them to nearest dealer, but be careful when stopping it will stall o you. IDK how much experience you have but it beats paying to tow it.... Hope this help any

 

I'm assuming with my answer that the pedal moves up and down, but the clutch won't move.
It's a hydraulic clutch. Make sure it has fluid, The reservoir is on the firewall near where the steering column comes through the firewall. You can only see the top of it and the screw top.
It takes regular brake fluid you can buy anywhere. It doesn't hold much, so don't be surprised if it fills up fast.
after filling it up, press and release the clutch several times to get the fluid into the system. Then, you should be able to get it to release.
My truck has had s slow leak for as long as I've had it. every month or so it will get hard to release the clutch, and I add a little fluid.
if you've ever bled brakes before, then you know how it is when you pump the brake pedal and it gets stiff as the fluid gets into the system. Your clutch is basically the same thing. Good luck. Hope this works for you.