I have some strange airtime usage, even though I didn't place the call. I went to Korea for 2 weeks, Nov.8~ Nov.18 and didn't even use phone, but it says i placed the call at Edmonton to Edmonton,at Nov.14. I had tons of this airtime usage and Koodo had charge me $40 every month. I've never place call. I use message instead of it. Should I visit Koodo service center and solve this problem?