PCP's are very good methods of funding cars providing that the APR is only a few percent more than that of a normal HP agreement. This is because you have the option of returning the car should the residual value plummet. Our own finance company Hartwell Finance experienced this during the Rover collapse. The finance company takes the risk of the residual value and for that they expect to charge an element of interest.
In your case you appear to have signed on trade premises so assuming the agreement has been properly executed then you need to ask the finance company for a settlement figure and pay this having obtained funding elsewhere. Might be worth asking if they will improve on the rate or offer you another product as I am sure they would rather not lose valuable custom.
You will pay some interest and the finance company is entitled to charge up to a maximum of one month interest penalty but you will pay considerably less interest in total than if you run through the life of the agreement. To be sure it is worth doing you may want to compare with the loan you are about to take out. Compare like with like too as if you take your next loan over 60 months to keep the payments to somewhere near those of a PCP then you may pay a lower rate but the total sum of interest may be more than the 2000 you mention. One benefit of PCP is that if you do keep the car at the end of the term you can refinance the final payment over say another two years and the total interest is often less than if you had financed over the 5 years from the start. Hope this helps.