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I am so sorry to hear this. If you have exhausted all internal remedies you should consider filing a lawsuit in small claims court for breach of contract, deceptive trade practices, and fraud. This may get their attention and hopefully address the premium increase. You do not necessarily have to go through to trial but your filing of the suit will certainly result in discussions with someone in authority. I personally have also written letters to the president of one of my insurance carriers and it lead to resolution.
Since they entered into Pennsylvania to do business they are subject to jurisdiction in Pennsylvania.
Let me know if you have additional questions.