What is the best solution to a guest complaint rather than complimentary service?

accepting the mistake (if or if not),polietly suggesting him to the some other best thing.

 

Talk and listen to the guest what is their recommendation .offer the guest into another that will surely be like..then in ivite th again to give much better service for the next visits

talk to customer, sometimes they need a guy in suit talk to them in generous way. accept mistake, be calm and problem solving, say apology.

Complementary services, is the best one.