I am so sorry this happened to you. But your wrong: you CAN do it!! You have come so far don't give up. I am going through the six month supervised dieting and I can't even imagine how I would feel if after all this I go For surgery and something goes wrong and I have to start over.
However if that did happen I would want someone to talk me down off the ledge and stop me from quitting. Giving up is not an option. Not for you who has already been able to prove you can do the liquid diet. I would be having a serious talk with the staff who crossed up insurance but I would not give up. Please don't give up.