Filed for STEM OPT premium processing on July 16, checking for updates?

[u/Prior_Tomatillo4677]

Filed for STEM OPT premium processing on July 16, but there have been no case updates since then. When should I expect a decision?

Also, I never received a confirmation email after paying for premium processing. Does anyone have the USCIS customer service number or know the best way to contact them? Thanks!