yes I certainly will be telling them as not like it can go back. unfortunately no I don't have a sump it's or anywhere else it can go . so my only option is to just leave her?Do you have a sump? It may be easier to create a little land in there.
As for being sent the wrong crab then you need to speak to the seller and show them their mistake. I'd be surprised if you didn't get a refund or at least another crab.