Pizz As customer service, they obviously will just apologize first.
So, just because there are duplicate entries, you are saying there's something wrong? I don't get you as there's no logical implication. Furthermore, all the dates and times are the same, which doesn't imply any problem.
To say that duplicates = bugs = incorrect storing of data = incorrect chapter unlocks is a logical fallacy that doesn't follow.
Furthermore, you do know that it's actually easier to unlock chapters from the back due to the way the Desktop browser works? I personally did that as well. You can just scroll up to unlock chapters faster than scrolling down. I don't have to give explanations on why you unlocked them in that given way and neither is this proof that your data isn't stored properly.
For SSM, you didn't come to Webnovel for the 11/9/2017, considering how you did not read other books either. See SSM, you unlocked 176, but not 177 which was released on 8/9/2017. You didn't appear on 9/9/2017 for god knows what reason, nor did you read any SSM chapters for 10/9/2017. You only came back to read SSM on 12/9/2017. By then, Chapter 177 had become free to read and Chapter 180 had been released, and I guess that you had 178 locked, so you unlocked it, along with 179 and 180 in the subsequent lines beyond 20. As such, you lost the ability to unlock 177 simply by not actually watching an ad/paying 4 SS.
Just the fact that you have gaps in your time, 9/9/2017 and 10,11/9/2017 tells me that you aren't reading daily. Which means you will have missing unlocked chapters due to how the ad-wall system worked back then. Read the explanation I gave to Skaz.
Perhaps you can find a series of dates of you showing that you came every day, and unlocked chapters in what would be a reasonable manner. ie., to counter my point there are 4 consecutive chapters to unlock, but for some reason, you unlocked 3 out of the 4 of them non-consecutively (ie, you unlocked chapters 1, 2, 4 and somehow did not unlock 3). That would be a bit more convincing to your case.
Regarding LXY, that will depend on the Webnovel's teams investigations. But it's very clear that you aren't a regular reader, so for your other accusations, it's simply because you weren't around to unlock them and they got released free to you.