Can I change the car I want at a Ford dealership UK?

I have recently paid a deposit to buy a brand new Ford car on PCP. The monthly payments are affordable. I have also signed a contract Declaring that I agree to purchase the vehicle.

Two things have creeped up with this brand new vehicle. I asked the dealer if this vehicle had a DAB radio and he said yes. On further research it turns out that the DAB is an optional extra therefore I had been told wrong information as the DAB radio is not an optional extra I paid for.

The second issue is the finance option I chose to pay for the car. It is a PCP meaning I have a balloon payment at the end of the finance. I did not originally want a PCP however the salesman persuaded me by leading me to believe I could use the Balloon payment as equity to put as a deposit for a new car when the time is up. It turns out on further research the the only equity I get would be the value the car is above the ballon payment value.

I may be wrong. This is a brand new car that I haven't physically seen. It will be available for me to pick up in roughly two weeks, meaning that It may not have been dispatched to the dealership yet. I do not have any evidence of misleading information however I have one witness and I know what they said.
I feel as If I was mislead into a sale that would benefit a dealer a hell of a lot more than me. I'm happy for them to keep the deposit I paid towards a different car maybe second under a different finance plan.

What are my rights?
Am I wrong about the PCP equity

Rather than going with "rights", simply ask to change to a different vehicle / finance plan.

Because they vehicle hasn't even arrived at the dealership yet, they should be able to tear up that contract and write up a new one, with the options you actually want.

So my advice is. Try asking nicely first.

Most car dealers would rather sell a different car to a happy customer, rather than enforce a contract, and suffer the bad PR that this would create. But if it came down to who is legally right, you have signed a contract to buy that vehicle, you don't have any automatic right to cancel it. If can easily be done by mutual agreement however.