Data Rates

I Have recently purchased the 20gb promotion from Telkom. The Promo comes with a home Router and a mobile wifi router, each allocated with 5gb day data respectively.. on the mobile router the allocated data was depleated within a week to my surprise, i called into the call centre to resolve the issue and understand why the data is moving at such a rapid rate, a case was logged with a turn around time was 72 hours(its been over a week) . I then requested them to allocate me with a further 2gb worth of data while i waited for them to resolve my issue, that too depleated within a day, when i called to quiz them about it as it wasnt connecting, they managed to retrieve about 200mb's. This is very strange because i survived with about 3gb worth of data the entire month to using 2gb a day and having no break down from telkom on how and where the data disappeared to, im disgruntled and highly inconveinced by this , ive been back and forth with the call center and ive recieved no help whatsover, i just get told my case has been escalated, in the mean while i sit with no data, and the only other option i get given is to purchase more data while i wait for them to resolve the disappearance of my previous bundle..