I haven't received a single check my Sun Life

I have been off work due to surgery. I was approved for STD. To make a long story short, I have not received a single check. When o called to inquire about nonpayment, I was told they sent it out. However, they sent it to the wrong address. I then was told they will have to stop payment and reissue them again. A week later I call back and was given the same excuses. I asked to speak with a supervisor since I have never in the entire process spoken with my claims rep. She informed me they would manually create a check since it was a data entry error on their part and send it out next day. Guess what? No check! What is my next move? My bank account is in overdraft and I am 3 payments behind on my auto insurance as of today.