My mac wifi connection to DSL line was down when I tried to upgrade Ipad to IOS6, and it defaulted to Ipad data line and consumed my monthly allotment of data -- How can that happen as a technical matter?

Maps did not work for me for the first week after upgrading to IOS6 on my New Ipad -- I have since learned that I exceeded my 2 gig monthly data plan and therefore I had no 4G access on my ipad, which meant Maps couldn't work while traveling.  Since I never download videos, I knew I had not knowingly downloaded that much data.  When I called AT&T, they told me that when I upgraded to IOS6 I consumed over 1 gig of data.  
I did the upgrade while connected to my iMac, which in turn has a wireless connection to router connected to my home DSL line.   My wifi service has been spotty lately, possibly because router is defective.  So let's assume that when I tried to download IOS6 that my iMac did not have a good wifi connection.  Is the AT&T person correct that the download defaults to the Ipad's 4G cellular network, even though the iPad is connected to the iMac by USB cable?  I didn't think that was possible as a technical matter -- i.e., that the iMac gets automatic access to the iPad's connection to the cellular network.  (I'm sure I'm not explaining this right, I'm obviously not technical.)   
Also, do you get any obvious warning or indicator on the device that you have exceeded your data limit for the month?  I sure didn't see any warning, (although I now know that I can go to Settings, then Cellular Data, then View Account and find the status of my data line account).  
Thanks for any help on this. 

Strange. It works fine with my setup which is no different from yours. Problem with the cable or LAN port(s)?

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