Throttling based on daily usage and not 30 days

I signed up for 4Mbps Uncapped ADSL account. I was told when signing up that throttling kicks in at 110GB in a 30 day rol***** window.<br> It went well for about 12 days and then I suddenly noticed my line was extremely slow. Speedtest showed download speeds of 0.2 to 0.4Mbps.<br> I checked my usage and at that time I had used 98GB and my status was Throttled.<br> I emailed MWEB asking why I was being throttled if my 30 days usage was at 98GB.<br> Their response: \Our records show your usage since activation has been 99.23GB. Please be advised that the threshold for your package is around 110GB over a 30-day rolling period (not a calendar month). <br> The account is only calculated on the 30 day rolling period once it has been active for 30 days