If you get reported, nothing you post here will be relevant. GMs who handle investigations, sanctions and appeals do not come here.
So long as you didn’t respond with any foul language or whatnot, you likely will be fine. Right-click, report, and keep on about your business. I hail from one of the largest servers there are. This is the first time I’ve heard of anyone trying to do a mafioso takedown of a competitor. The person who whispered you likely has no backing to or was hoping to stir up some grand conspiracy mess.
And just because it has to keep being reiterated - THERE ARE NO AUTOBANS.
If you’re not doing anything? Nothing will happen. At the absolute worst is the temporary squelch. That and the warnings are the ONLY automated part of the whole report and appeals process.
A warning is just that. It’s a warning to stop doing what you’re doing that could be in breach of the CoC or ToS. These leave no black mark against your account. This part is automated.
A squelch is a temporary silence on the account. This is a temporary measure to stop any questionable chat or behavioral violations. It is only in place long enough for a GM to look over the data. The squelch in itself is not a black mark against your account. This part is automated.
Now, following the squelch, ir can go one of two ways. Either the GM disagrees, the squelch is removed and the player can enjoy the game in it’s entirety. Now, if they agree? Here is where it goes into bad territory.
A silence is the removal of all social interaction from the game. Cannot chat, cannot form groups, etc. You can play the game, but in a way so as that you cannot be repeating whatever action earned you this punishment. This will leave a black mark on your account. It also is something only a real live GM can apply. This part is NOT automated.
A suspension is when you’ve either been silenced already or what you’ve done was so heinous they jumped right to this part. It is a complete denial of Blizzard’s properties for that account for a set amount of time. For most chat and social infractions, this can double each time you’re suspended up until the time they decide you’re a lost cause and the account is banned. This leaves a black mark against your account. This part is NOT automated.
A ban is when you’ve done something so egregious or have had enough suspensions that they’re just done with the account. It is complete account closure - for good. There is no time limit on this. This part is NOT automated.