Is it an ERC20 based token? Can you show the *public* exchanges which has listed your Sinergia SNG for trade?
Bitfinex is public, I think.
1) the main goal is to avoid the inconvenience in the future
2) they started sooner
I'm a "SnowGemmer", but they must be right.
There is no problem with this, let's rebrand

The SNG symbol on Bitfinex does not belong to Sinergia but to SingularDTV, which is weird since SingularDTV use a different symbol on all the other exchanges, we'll contact them about this.
We are talking with the guys from Sinergia to find a mutual agreement. We'll inform you as soon as a solution is found.