i too was searching an answer for the same problem, its too annoying, tapping the screen frequently was such a waste, i then stumbled upon an app which i think is of great help.
As a matter of fact, these messages are USSD protocol used by GSM cellular(used for wap browsing), so i searched the app store and got an app called 'balance update/ USSD blocker' and downloaded it
when downloaded it prompted me to settings where i could control the frequency of this messages as well as block messages by matching some of the keywords, IT WORKS !!!
so you can try this too, hope it helps