what are the consequences of bad customer service in the travel and tourism industy?

e.g. complaints

The loss of customers.
Which is exactly the same as in any industry.
It is easy to lose a customer, and once you have lost one through bad service, they never come back.

Not much. In a day of corporate budgets, low cost typically wins the day for the business traveler.

You have more flexibility as a consumer, if you're willing to pay for what you get. Unfortunately, not enough of us are willing to do so.

You can always try putting comments on websites, which at least might make you feel better.

the consequences is bad word of mouth advertising and your tourism doesnt bring in tourists you go bankrupt you start a bad coke habit to feel good about yourself and you die in some gutter

Loss of return customers and loss of potential costumers who are influenced by the disgruntled customers.