Has Cox/any internet provider done this to you?

Originally purchased their 250 Mbps internet. Today I get a notification that my bill is going up due to a promo ending. Tried to call and see if I could get it back down to the original promo price. Upon discussion, the Cox rep said "you can keep the same 500 Mbps speed at *this price*" and I told them to hold up because I know I never had 500 Mbps. At some point, 3 months ago I had my internet magically upgraded from 250 to 500, and under a new plan name. Never got a notification or anything.

Only thing I ever checked with my Cox bill was to see if it was the same price since that's what the app will show me. I pay the bill, then move on. Going through the rest of the bills, they show sections of what I purchased and any discount I received, either through bundles or promos. There were no discounts added. They just gave me 500 Mbps at the original price of 250.

I'm guessing Cox and possibly other internet providers sneak in these upgraded services without knowing, then will try to use the whole "get the same speed you had for this price" conversation when customers call about their promos ending. They probably think people won't look past the previous first two months' bills. Has anyone else ever noticed this with their internet providers?