Here is a link to a Stuff article on the comments by builders involved in doing building work for EQC and Fletchers.  Beneath the article are comments corroborating the content of the article that EQC and Fletchers are not blameless for the defective building work.  Both EQC and Fletchers ought to be legally liable for any defective building work.  I am aware that both have previously been sued for defective work.  I would not rely on either to remediate defective work and homeowners have no obligation to allow EQC or Fletchers to try to remedy defective work.