Jet unprofessionalism

I am so disappointed with Jet. I contacted jet telephonically in order to close my account in July and requested a settlement letter. I was told that they will send it within 48hours. Today it's the 3rd month. I tried to send emails several times but there's no response. When I check my credit report the account appears as active. I wish I could take this matter further and I am happy because "calls are recorded".