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You cannot legally prevent them from liquidating your company but if you can convince them that you will actually have the money just a few days after they are proposing court action, they likely will give you a little more time.
If they seem reluctant it may simply be because previous extensions have proven unhelpful from their point of view. The onus is essentially on you to prove to them this time is different.
If you feel they are being unreasonable, as it appears, then it may help to contact their manager.
I trust this assists your understanding.
Good luck and please rate my answer.