Data and air time depleted without notification

<p>On 19 Dec I loaded a 3Gig bundle and of course received my subscription airtime on the 1st. I usually receive several notification sides to inform me when my data bundle is running low. I received NO smses but last night I discovered that my data bundle AND my entire subscription air time was depleted. Gone without any warning or notification. I have also had to waste extra money leading a bundle so I can sort this nonsense out. And this is not the first time this has happened. Please can you refund me my air time asap.</p>