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It's up to you to decide - as it seems you're not quite interested in collaboration.
There's nothing to be done if there's no goodwill from your end.
Then this is an ultimatum right?
We will not be notifying you until the deadline comes as it makes no sense + you've started insulting us and we're not going to ignore the rudeness.
Actually you have done this weeks ago , because this is a total nonsense talking to a person in which only His side is what His concern and not for both parties .