PSI Services review: Maryland testing center not found

I finished the nail technician theory test in September. After that, I need to take a practical test to finish my Nail Technician License. When I came to the website to take appointment online, the website showed "Testing Center not found". I call for the candidate support of PSI and they give me with a thousand reason including "We will send email to department, we going to escalate this problem for you, you have to wait for 24 hours, so you have to call back after 7 business days". I keep calling them during almost 3 months, but my problem has not solved. They gave me almost 6 ticket number, but nothing happens. I still cannot make any appointments. They told me all testing center in Maryland are close. I ask to talk with manager or advisor, but they told me that they cannot connect it. I have to wait for their manager to call me back. I really don't know how to do with this issue. I feel like they try to pass my issue. If someone have any phone number of PSI to fill the complaint, please give me.