The penalty imposed by the collector shall be paid by the firm or it can prefer an appeal against the order or can approach civil court for stay of the impugned order. The society has nothing to do with this.
However since the collector did not visit the spot nor there was any prima facie reason to impose this penalty, this may be challenged through a writ of certiorari or mandamus or both together. The strong reason to this that another property of he same which was duly inspected was not imposed with any penalty hence this order is erroneous. This fact should also be highlighted.
Also since the partnership ir dissolved even before its formation, there was o firm as on the date for disposition hence the order can be held invalid.
You may draft a petition his way and file a suit or an appeal.