What to Do?

Some months back I took against a bank hard for having charged me unfairly in my Cash credit account and were after them through all ethical means until I got the charges reversed. As is with me, I promptly sent a message to the Manager thanking him, though there was nothing to thank them as I had to make couple of repeated calls to remind them to do so. I felt this is how I should close the issue, so that they don't accuse me of not having informed them when the interest was reversed while I was always after them for this. But , to my disbelief, I got the same wrong debit reversed again ! Which means they have over paid me.

The same situation happened to me (I don't know why its me always at the receiving end- pun intended) again when a popular cinema hall charged me for an online transaction but failed to deliver the service. After I took up with the Credit card provider and also the Theatre , I got the wrong debit reversed - this time also twice !

While I promptly informed both these parties about the double credit, it still remain un-reversed even after a month ! Now I am in a dilemma what to do - whether to keep reminding them or keep cool with unexpected bounty- though small they are ! I do not want to be accused of sharp practice as  was done to the great Mahatma when he pointed out a wrong entry in his client's account, which argument made his client lose the case ! At the same time time, I would like to wait and see as to how their accounting system detects this or test the efficiency of their audit system against leakage of income.

I am at the crossroads of a middle class dilemma. If some one could guide me on this, I will credit them with lots of good wishes, even twice !!