tried of fix heating

these people charged me $300 to fix my A/C. when they were done, i didn't have heat, but had A/C. i took it in AGAIN, and i didn't have either when they were done! i finally took it in again, and they acted like i was trying to scam them or something when my car clearly blasted cold air in the winter and hot air in the summer straight up from outside. then after that, they tried convincing me that i had to pay them another $600 for "the next step in the process." ARE YOU KIDDING ME???? ridiculous. i took it in to another shop and they fixed the problem in 20 minutes and charged me $100. never, ever going to this shop. don't recommend it. these people are trying to scam you out of your money.