Data bundle issue

My 2 GB data bundle depleted before 2 months period elapsed. I made countless call to Telkom without any luck. They tell me it only last for a month even though ever since i used Telkom it has been lasting me 2 months. I am experiencing this for the first time now. They cannot even escalating it to someone senior to explain my problem. This is the worst service i ever received from any company in life. Even from their website is is clearly stated: https://secure.telkom.co.za/today/shop/plan/data-bundles/. I even have an sms showing the proof of that as well.