Your words implied that you considered the game broken even if you didn’t explicitly say the word “broken.” That’s why he told you it’s not broken.
100% of the complaints people have when they say their dinosaur is being beaten and they disagree because of X reasons and armor and what not, it’s because they feel that the game was unfair to them. When a game does not produce the outcome that a player wants, they automatically assume either a hacker cheated or the game is broken.
In your case, the game is functioning fine but you just happen to be in a bad streak of luck so you lost a bunch in a row. That’s all it is. It’s still possible that you have come across a person that was cheating but to come across them every match where you lose is far fetched. Also, to only lose 12x and quit until the ban happens is really drastic.
If your dinosaur is getting one shot killed it can mean many things. The opponent was using which dinosaur? What level was it? Which ability was it? Was your dinosaur already vulnerable at the time? Was it lower HP at the time? There are a lot of factors. I’m sorry you lost 12x in a row but that’s not a problem with the game. You just need to level up your animals more and rethink your strategy for the next battle. Good luck.