It's so terrible to have paid that kind of money for a cat that does not even come close to a Devon. I have devons, and while one is a sphynx cross, I don't tell people what they are going to get from a litter. My male doesn't have the best Devon coat, but WE like his coat. He has grown a lot of hair over the past year but still is not a full thick wavy coat all over. The kittens came out half and half...half had full thick coats while the other 2 had the mom's coat. I would never sell a kitten for that kind of money knowing that they do not fit the standard even remotely close to the breed.
I hope you can get some money back from this person, I have heard of Adoraelves before and seen advertisements. I hope that with your sister showing her Cleo, that she can put you in contact with an appropriate breeder.
On the bright side, the kitty is a cutie and needs you to love her