[TV] API problem

TV capabilities ‘audioVolume’ and ‘tvChannel’ are hardly updated after sending POST API(command).
Although real device’s volume value changed after sending command(‘volumeUp’), the value of API(GET STATUS) wasn’t updated.

Also the response results of POST API are usally(about 95%) ‘COMPLETED’ which is written as a unknown status, not ‘ACCEPTED’

How can I fix this problem?