Can I sue my attorney for paying $ 5,700 upfront but nothing is done on my case for 4 years ?

I hired a lawyer Immigration from October 2019 and I stopped her service on July 22 2022. I signed an agreement with the lawyer but the contract said no refund if payment was made . The agreement was two parts , my lawyer told me i will get two interviews. The 1st interview will cost $ 4250 and 2nd $ 4250. The total payment was $ 8500 , i paid $ 6200 . I stopped her service because nothing was done on my case. I was understood if I got the two interviews and Immigration denied my case , I did not get any refund. Since nothing was done on my case ( no interview) and she just refunded me only $ 500. I called her many times; she never answered the phone.