You cannot pay same bill twice in the same day.
Same goes to mobile reload cannot reload same number twice in the same day

May i know it take how long to reflect in your both telco account?

I did it yesterday, check today still no update yet.

yes, it can be avoided by clearly defining INSTANT. But then even if you avoided the INSTANT part, repeating it for xxx times in a matter of weeks/months can also be considered as suspicious too. It's a hassle to list out all possibilities    So, they can always hide under a general clause of "We reserved the rights to suspend anyone"
it can be avoided by separating funds inside the wallets to two categories (or more), those from "reload from credit card" category will not be allowed to withdraw/cash out. It's as simple as that and should be pretty easy to implement, anyone wants to guess why none of them did it yet 

Couldnt agree more.
Thanks to this financial & cc forum, without much effort, I estimate I have "earned" >100k for the last 10+ years playing cashback campaigns and the financial merry go round using banks' money while my capital is seldom used n is earning.
Only drawback is I neglected the investment forum which could have earned much more.