I assume you were in J class. It's hardly the end of the world being in a middle seat.

You offloaded yourself at DXB, and then you complain that you had to pay to get on another flight?

No doubt this would have caused the flight to be delayed, disrupting all the other passengers.

Fair enough, you have a valid complaint that your original seat was changed, but other than that it sounds like acted very badly.

Cheers,
Rick