Indane Gas — g. s enterprises fraud

Address:	faridabad, Faridabad, Haryana, 121001
Website:	ff-work.in

I am also in same condition so what we do now we should pay them or not

They already mention according information technology act 2000 digital sign act applies to the validates for basic purpose therefore is to authenticate the document. To identify the person and to make the contents of the document binding on terms. Digital signature raise the same liability as the regular one for the causes of criminal and civil matters.

& without notry or affidavit this stamp paper is valid for court matters?
They demanded 5000 rs. Under 7 days & not paid before date they demand additional amount
I dont want to pay him money & don't want to go court matters. So what i do
Please help me.