Paid for a new A/C unit 2 yrs ago and have had to ...

Paid for a new A/C unit 2 yrs ago and have had to call them at least 4 times. Ridiculous! Should not be having issues with a brand new unit. Maybe sold me a lemon! Called twice within the first 8 months. My unit is horrible. The company won't call back! No wonder they want you to buy their service contract because they know that'll you'll be calling to use it! I've called Better Business Bureau twice! Service America sucks!