Update:
So there were 6 days on which someone from TN could "use" offers to get cashback. The 7th was do all 5 types of transactions. During the 14th to 31st there was an additional DTH offer making a total of 8 cashbacks that I was expecting for transactions in this window. I am excluding the one like 200pe20 which is uniquely identifiable.
Now this is what has happened so far:
1) I have received 5 cashbacks as I speak
2) For one, The Money Transfer seems to have completed a day later (Dont know if its correct as I am not 100% confident the receiver received it on the day of offer or not
3) For one, I found later the system had automatically changed primary number to a relative, whose number I had just recharged on their behalf and since the offer says only if you recharge primary number, that might have been marked ineligible. And I am not sure if I have patience to follow up and argue that it is not my fault
4) For one, no clue.. Not sure how to identify the "missing" one & try & follow up for that one.
I am thinking of giving up, as in any case got Rs.450 as cashback for transactions in those two weeks