If there is a mismatch in the tally, you can argue. So, keep a note.It is necessary to verify things. Suppose if you have already paid the utility bills and later if there is any discrepancy found in the records of the company you can immediately produce the money receipt to prove that you have already paid. Though nowadays the chances are less, it can still happen in a few cases. We do not always remember what we say but others do remember what we said at some instance and repeat it when they found there is a slight deviation. This happens with all of us and since it is impossible to keep a track on everything, you can keep a note of a few important things. You can jot down some important days or incidents, even if you like you can note it down what others have said on a particular day about a specific thing. I am not telling you to challenge others all the time, but you will find it handy. I have found members while posting threads, refer to some other threads with a hyperlink to notify what was said about a topic earlier or to notify something important that was clarified earlier.
It is good to keep a tab. Even during our discussion, we do the same thing. We challenge others to point out what was done earlier about the same thing. There are many instances when others say that you have performed a sin or may be a virtue. Keep a note of them also. Who knows, at the entrance of hell or heaven you may be questioned about the deeds and if there is any mistake in their records you can point out the sins and virtues to argue which place is fit for you.