Disservice (noun)

1. An act or instance of failing to provide a service or help that is expected or required.
2. An action or inaction that harms or harms the interests of someone or something.

Origin:

From dis- ("not") +‎ service ("servic.e")

Examples:

1. The company's failure to notify customers of the data breach was a disservice to them.
2. The employee's dishonesty was a disservice to the company and its customers.
3. The lawyer's poor representation was a disservice to the client.
4. The doctor"s failure to diagnose the patient"s condition was a disservice to the patient.
5. The school's lack of support for the students with disabilities was a disservice to them.