Collocations for hotline - noun

telephone
24-hour
free, toll-free (AmE)
customer-service, information, ticket
national
credit-card (BrE)
suicide (esp. AmE)

call, phone, ring (BrE)
Call our 24-hour hotline to find out if you have won a prize.

establish, set up
A telephone hotline has been set up to give information about schedules.

have, run
The company has an information hotline that customers can call if they are worried about products.