I140 Approved but H1B Extension got denied

I am on my 3rd year of H1B Visa with I140 approved I work at client location and have a vendor in between my employer and client. I applied for my H1B extension which got denied, and my current H1B is valid for 1 more month Guys could you suggest me on the following: 1 My employer had requested H1B Premium Processing Unit for Supervisor Review: Does anyone know how this works and how long it might take for them to review? 2 My employer is ready to re apply for a new Extension: What happens if this also gets denied? 3 Can I switch to vendor as my new employer and have them file for it? Any feedback to the above questions will be very helpful Thx

Any progress on this ?
I am in same situation and need help.