The son gets Power of Attorney of the senior I am taking care of and doesn't pay me, the caregiver, back.

I was employed as a 27/7 caregiver for 5months two weeks paid $3500 a month.Providing total care for 76 year old with end stage liver & impaired mental status, After tow months he was not able to do the bills & asked me to take over. I called his son & asked what should I do. He said go ahead & make out checks for all bills you get in the mail. He said as soon as I get Power of Attorney I"ll take over He lied. In stead wrongly accused me of fraud&shut my bank account.