technical support
noun [ U ]
ukus(also tech support) IT
an advice service provided by a computer company, often by phone, for customers who have bought a product and are having problems using it. The department providing this service is also called technical support:
If you encounter any problems, contact the manufacturer's technical support.
The company provides a 24/7 toll-free support line for purchasers of its software.
One of the guys in technical support will be able to help you.