What's the issue
If you feel you've been cheated then take your device back to the store and they will give you a refund.
Years ago I bought an Ericsson T39, it was one of the first phones to support GPRS and was advertised as such. At the time there wasn't a single network in the UK supporting GPRS.
the terms 1G, 2G, 3G, 4G are meaningless to most people aside from, is it faster than the old one?
Sure technically it's not 4G but if they want to call it that, why stop them?