Need to Recover Lost Formula

This is a little bizarre but help would be appreciated. We used Excel 2000 to do the bookkeeping for our business. The formulas and template that we use was set up by an accountant, and since then we always just fill it all out by ourselves. Today, however, one of our cats was on the keyboard and somehow managed to change the formula and now it doesn't work. We have no idea what the original formula was or anything, is there any way to change it back? The Undo command did not work, restarting Excel did not work, and restarting the system did not work. We do have a blank template that we can use if necessary, but just hoping that there was a better way. Is there any way to revert formulas or anything like that? I realize there is very little info to go on, so sorry, but any help would be appreciated.

If you have the original template, open it.

Copy the formula from the template back into the cells that have been damaged in your working sheet.

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Thanks for the title change.

You need to go back to a prior version of the workbook, or a template as JB suggests. Lacking either of those, post an example and explain what it was supposed to do.