2001 Ford Expedition why it is not getting as cold as I wou

I wanted to know why it wasn't getting as cold as it was suppose to so I took it to a shop they did an airconditioner check(theysaid) and said it was some hose in the front that was leaking and it would 400 and somthing dollars to fix so I got a second opinion these guys said that they had to do a preasure check which they did and they blew out the airconditioner totally NOw it doesnt work at all and the heater doesn't work either. The part underneth the glove box it blown all over my car and the under under that is blown open. There is also green dye all over my car all the way to the back window. They tell me that I need to now pay them 505 dollars to fix the evaporator core Which they said had already had a leak. PLEASE !Someone just tell me what is going on I think the second place is trying to pull one over on me. I just want to know what I need to do to have my heating and air back and if these are really the problems.