Re: How do you solve a problem like an Exalt?
If you're a competent drug lord, you already are giving a portion of your take to the existing lords of the city, in return for favors. So you point out to your old and reliable friends that the upstarts in the council are going to be cutting into your profits, and therefore you won't be able to help them out with their civic projects as much as before.
Of course, fighting in the streets - and killing dealers and the like - would be highly counterproductive, for all parties. At least, that's a reasonable assumption to make once the invaders have demonstrated that they are Exalts, and therefore cannot be easily removed. Ideally, this demonstration should be made on someone you don't like. A rival drug lord, perhaps?
There is already plenty of product in town, so there isn't much of a market for ay extra. You can explain this (with charts, and via disposable minions) to the newcomers, ad offer them a share of the existing network instead. All they need to do is protect it from outsiders, convincingly demonstrate that people should pay on time, and so forth. Even if they have better products than what you're currently offering, you have a better network so it's really in the Exalt's interest to work with you in order to make more money sooner.
The problem with a violent approach is that the Exalts appear to be better entrenched than you are, so you're liable to have fewer troops since the local guards might side with them. Therefore, you really don't want to go looking for a fight, except on your terms.
Have a decoy boss antagonize them, get wiped out, and surrender, offering your (better established) network in recompense. It means less profit, but you're still alive to rake in the cash.
Inviting the Wyld Hunt is an option, and even if thy don't turn up, they'll likely give you useful pointers on how to do things.
Use poison and other ditry tricks, and keep the Exalts jumpy - the less they can rest, the more drained they'll be when you send minor probing attacks. The goal is to tire them out, keep them constantly on their toes, so they run out of juice. An exhausted Exalt dies as easily as anyone else (well, almost).
Most of this is based on the premise that you're not going to try opposing the Exalt directly (you're in this for the money, after all - injured pride doesn't pay wen facing a force of nature). If it turns out that the Exalt poses an existential threat (i.e. they're out to kill you no matter what), it's time to resort to extreme measures.
If you can't manage to get the Wyld Hunt to turn up, use your Guild contacts and grease the palms of a few priests to bring in other supernatural threats. Mostly, you're doing this so you can have a breathing space with which to grab the money and run, but a few divine curses, or a Raksha hunter looking for a challenge, have a decent chance of distracting - or even removing - budding Exalts.