Wizz Air - Not flying wizzair again after paying 60 euros for inexistent priority

I would like to request a refund for the 58.8 euros I paid for Wizz Priority, which I choose mainly so I can be one of the first to board, and to be able to bring my trolley.
I request this refund since, when arriving to the gate, there was no priority boarding: there was one single queue. Besides, people without priority were also bringing their trolley as no one was checking this. Considering this, I paid for a service I didn't receive, and I didn't need to have paid, as my trip experience would have been the same.
In addition, the person who was travelling with me paid 15 euros for a seat, to be seated next to me. When entering the plane, the cabin crew told us we couldn't seat in our allocated seats. Again, why pay for a seat and then be denied that seat?! When we mentioned we would like to be seated in the seats we paid for, she was incredibly rude.
On a side note, I have also never seen a dirtier plane: the floor was totally black in the seats where we were 'forced' to seat, and it smelled.