Here’s what consumers have asked with answers from Onecom staff and previous consumers.
The ombudsman is OS communication. You do have to lodge a complaint and you need to email using the word complaint then os should be able to help you the number is 03304401614, every telecommunication company has they own ombudsman.
You will never get an answer from tru telecom, once they have you it's hard to leave without paying tru lots of money