Welcome to Bunnings Workshop community @Mike. It is fantastic to have you join us, and many thanks for your question about the lime tree.
I'm sorry to hear your plant is producing the wrong type of fruit. I'm sure that was a surprise, and obviously, the plant has been tagged incorrectly. We would be more than happy to exchange the plant for the correct variety if you return it to your local store.
If you need any assistance in this return process, please let me know.