my case is that I have the 457 visa since October I started working with them in December. we finished the contract two weeks ago I am looking for a new sponsor. At this moment I am in Tasmania something that helps me a lot for the residence. I have possible sponsor in Sydney. but I received a call from my former employer says that he needs me come back . but the immigration agents tell me that I can not use them again, I have already sent the letter to immigration informing the termination of the contract.
Can I go back to work with them?

Can I go back to work with them?