I started installing a radial circuit in 4mm² singles in white 20mm conduit for an office. MCB=32a. T-N-CS
Issue a certificate for the works you have done detailing the extent of your efforts,get paid and move on to the next job
Notification is not needed on your part for the work you have done
Whatever games he plays from therein is not your responsibility,that is unless you play the idiot card and complicate things for yourself by being involved in His testing responsibility,His Labc problems, and His certification problems