Hello Fahhad
Welcome to the SBB Community.
I booked the 4 day swiss pass thinking that it will be valid during any 4 days of the month but when I had paid it showed the validity from the day I booked to the next 4 days i.e 6-10 March
Indeed, you simply missed to set the first day of validity; by default it is [today].

Please immediately call SBB to correct it: +41 51 225 78 56 (247/7).
Kind regards,
Roland