again charged for whats app and bis

i am still being charge on airtime for when i use whats app and my bis is active. last night i called them and the ensured me the removed the apn internet setting to prevent that from happening. we had this problem previously that is how i know. but the agent i spoke to last night did not really understand what i was trying to tell her... now i am missing airtime and this is what it say on my bill 12 October 2015 12:22:21pm Internet access 7min 43sec