tech support

or tech·ni·cal sup·port

[tek suh-pawrt or tek-ni-kuh l suh-pawrt; ‐pohrt]
noun
  1. an advising and troubleshooting service provided by a manufacturer, typically a software or hardware developer, to its customers, often online or on the telephone.

Origin of tech support

First recorded in 1975–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018