Lied to me on intake to Urgent Care. I didn't have...

Lied to me on intake to Urgent Care. I didn't have insurance and they told me that if I paid $90 cash and there were no labs run or anything beyond talking to the doctor, I would not owe anything else. I talked to the doctor about what was going on, nothing else. A few weeks later, they sent me a bill for an additional $115.