2015 MacBook (Retina) 12" - keyboard and trackpad are now non functional.

Usually you'd have a case number or incident, on record. In reference to an

earlier visit and repair order, that number should allow access to an issue

and also revisit the item. These official repairs (done at Apple or authorized

service provider or Apple repair depot) and their issues can be escalated.

Find number for higher authority and call Apple service (if it was Apple?)

and ask for another service supplier, if more than one exists in your area.

An escalation when a disagreement exists, can be useful to resolve an issue.

Problem in hardware in macbooks with this symptom, often is with

'top-case.' Or, associated parts of those mostly sealed assemblies.

Most who reply to these voluntary help forums are not employed by Apple;

nor do most see any compensation. There's nothing special that I've seen.

We're mostly just product users, who find some spare time to try & help.

And since May 2003, I've tried. Nothing easy, here in any of those years.

Good luck & happy computing!🌻⛵️

I recommend contacting Apple Support for diagnosis under your 90 day guarantee.

All repairs have a 90 day guarantee.