PlumbSmart Plumbing Heating and Air review: I have a 4 year old mini split air conditioner that has a small leak but was working fine

I have a 4 year old mini split air condioner that had a small leak but was working fine. I hired PlumbSmart to fix the small leak. They charged me $4,351.14, the first trip and another $69.00 the second time. They totally broke the unit so that it will not work at all now. They have been here a total of 6 times since trying to fix the unit to no avail and now they say that they're not coming back again, leaving me with a broken, worthless unit and with the summer heat coming. I want the unit fixed or at least my money back. I had a heart attack on Christmas day resulting in quadruple bypass and heart valve repair. It will devastating for me without air when the heat comes.