Through a call a lady claiming she is from the technical dept having issues with my wifi, reported higher consumption in the past week. 
 
When asked what is my subscriber she couldn't answer and repeatedly answered twice she's from the technical dept. Forcing her into answering me, that's when she said she's from Starhub and Singtel but none of those are my wifi subscriber, asked if I was Natasha (not my name) and so she hung up the phone.