Lol yeah at this point wasting my time. What a bunch of failsYeah. At this point I'd let it go. Or you could call and explain it to them over the phone.
You know say something like "I didn't and don't want money back. I just want you to know it was mislabeled and now I'm going to have to give it away or find a bigger tank. You guys are the famous Dr fosters and Smith divers den even you shouldn't make silly mistakes like this. I hope I can find a suitable home for this poor misnamed creature that is going to out grow my inadequate tank space."