This would never happen in the US. We have too many laws regarding unfair competition, false or misleading statements, fraud and negligent misrepresentation, etc. The e90 has been widely advertised as having Bluetooth functionality.
There would be an instant class action suit filed, similar to the Verizon v710 suit that was settled in favor of the plaintiffs.
I assume Sweden has many of the same laws.
Regardless, it can't be true. With all of BMW's competitors now sporting Bluetooth, BMW could never drop it from their model lines. It would be one of the worst business decisions made by any company in years.
Your dealer is wrong.