..or is it ?
We all know the "proper work ethics" when it comes to resigning; do it professionally, don't come across as emotional and be "politically correct" rather than honest etc.
But is this correct 100 % of the time, or are there any circumstances where you couldn't (and shouldn't) adhere to the "politically correct" behaviour ? E.g. : What would you do if you were seriously misled into a position and it is clear that the management never had (or have) the intentions of keeping their part of the deal ?
I suggest this is still a juncture to be non-emotional but technically (rather than politically) correct.
Establish what ground you are standing on. The 'deal' you made - were the components that management have not kept to part of a deal recorded in a contract, email chain or other recorded communication?
Was there any potential for misinterpretation of who was committing to what?
You say 'seriously misled into a position'. Was the position grossly misrepresented, or was it (being honest with yourself) a case of you choosing not to see/hear the things you didn't want to?
You may arrive at what is actually either a breach of contract, or a frustration of contract (if they arent providing what they promised to ensure the outcomes of the role are achieveable). There are legal remedies for both.
Or if, as may be the case, it's a combination of being misled to a degree (which may be just some overzealous selling on their part) and not enough due diligence on your, then that bridge is one over troubled waters anyway and burning it won't matter.
The walk over bridge option is sit down with management, tell them the role is not as you expected based on the information that was exchanged prior to taking the role (see how you avoid blame but share responsibility here) and you are intending to leave. Ask them for an agreed reference and amicable departure. If they take a more aggressive stance, cite breach/frustration of contract calmly, and again ask for an agreed reference and amicable departure.