OnePlus 6T 256GB - Black - Unlocked

Okay, so. . . customer service acted professional in most cases except one, they had great communication, they were prompt in replies and were courteous but i'll get to the negative issue at the end, The phone iteself came very quickly in the post, great job there, and it was well packaged, The quality of the phone state, when I looked at the screen, it was very impressive for a second-hand phone, it looked brand new, no scratches, and when I turned on the phone, it looked even better, Now the negative customer service issue, Before buying the smartphone I asked the customer service agent for the exact android version of the phone, they replied that it would be either android 9 or 10, I said can you double check it yourself or with the seller? They said no we can't, I said if it's android 9 or 10 that's fine but I don't want it to be android 11, they said it would be 9 or 10, And when I checked the version after turning on the phone, it was 11, Now, because i'm tech savvy, I was able to modify the phone and install android 10, but here's the thing, most people would be pissed if they asked to have a specific version and not to have another version, only to find out that they ...