Altech overcharged data for more than 2 years

I took out a 300mb data bundle when I got my Android phone in January 2013. I have a Cel C Straight up 100 contract that includes 100mb data. Thus in total I would have 400mb data per month. <br> <br> However since January 2013 I have regularly paid additional charges for data. <br> <br> Much to my surprise when I discovered that my 300mb data bundle has never been loaded since Jan 2013. I contacted Autopage and logged a fault (672241) The excuse is the error only occurred when I upgraded in Jan 2015. Not the case. <br> <br> I followed up again with the call centre and was told the matter would be escalated to the manager and I would get feedback within 48 hours. That was 20 May 2015.<br> <br>