That is a typical burundi type frontosa. If you bought it from a online seller or business you might be able to pressure them to send you the correct fish for free (by threatening to expose them and name names) but if it was a private seller just selling their own fish then you will have alot more problems getting it corrected. I would contact them and send a copy of this thread to them, ask them to refund your $ or send you proper fish. Tell them if they dont then you will post a thread naming them and describe your experience here and at every fish website you can find on the internet. They wont want that, it can ruin them if they do this as a business.
Sorry you didnt get what you paid for. I got ripped off online with a black sand purchase. It doesnt feel good thats for sure.
BTW your fish is a nice looking example of a burundi, they could have sold this fish easily since it is nice looking. They just wanted more money for it. Greed is a bad thing.