Upgrade was actually a downgrade

I have tablets that comes out with my contract, on my tablets before the upgrade I could read the USB and I could connect the keyboard but with the new ones I can not, and that means I can not do the work that got them for. When I phoned vodacom they told me that I should have complained with in 14 days, and I asked them that what did they mean when they its an upgrade and if the package is not broken or damaged why do I need to investigate the functions of the thing's, and I just found out that this is the down grade and I am not happy.