What else can I do?

I (F68) was diagnosed with cancer the end of November. My doctor wanted to start chemotherapy immediately. I was still working and had large group health insurance, so no need for Medicare Part B. I retired from the job the end of December. I filed my application for Part B coverage on 12/6/24 by fax and mail. I have heard nothing from SSA and no one answers the phone at the local office. I have a SSA interview on January 22, but now find myself navigating cancer treatment with no health insurance. I have contacted my congress woman and I am waiting for her office to help. Anything else you would recommend? I am applying for low income assistance everywhere but that doesn’t cover all the costs. SSA says the application will be processed in 30 days and is effective the month after you apply. Is this true?