Have you been making stage payments to The Superior Real Estate Group Limited? When you're asked for another stage payment and it's not from Superior (as I assume your contract is with them) I certainly wouldn't be paying over any more cash until you've spoken to your solicitor about what's going on. If Oasis (and I think Oasis is a part of Superior anyway) asks for the next stage payment, check your contract as I don't believe the money is due to them and any claim for more money should now come from the appointed Administrators as they are now legally running the company.

It may be worth contacting the appointed Administrators at PricewaterhouseCoopers to get their thoughts on all this. Don't trust anyone! This is your money!