Petition approved but client on the name of which petition was filed is not with employer

My H-1B petition is approved on 10 dec’16. But the client for which i am working is no more with my employer as the contract was signed till 31 dec’16. Now i have to go for visa stamping.

  1. Do i need to apply with a fresh petition again or i can use the same petition and go for visa stamping.
  2. In case i go with same petition what should i answer if they ask about my client.
  3. In case if i have to apply with a fresh petition how should i proceed so that petition approval won’t long time. Should i go for premium filing of petition this time, What will be the difference between premium and normal filing in this case?