Seller won't give extention..what to do?

[Montel Ford]

I'm set to close Monday on a multifamily and need an extension because I'm pulling money out my 401k and they need additional forms to complete my withdraw.. we asked for extension for Wednesday and they decline saying they need the money Monday and if we want extension they're going to charge a fee.. I got off the phone with my 401k provider asking is their a way to speed it up and they said with the additional form I need they won't be able to finish my request until next Friday which I won't have the money until the following Tuesday... long story short they're in a rush to close on Monday and I don't have the funds because of this process... what would you guys do in this situation?