Unable to change candidate name in PSI

Hello,

i have faced an issue during the NCA test because there is a difference between my name on PSI and my Government ID. and they sent me now to reschedule the test, but i see the name still the same one and i will face the same issue. 

 I have already sent an request to PSI via online form but no response. Appreciated if you could let me know how to change my full name in the system so that could match my name in government-issued ID for exam registration.

Thanks very much.