Remote power &volume button only works

I have not been able to use this tv since I bought it. I haven’t watched any show my tv says error 003 only the volume and power button works on the remote I’ve done everything every one has said on YouTube and the instructions on the site. Do anyone have any other solutions I’m a truck driver this tv is already mounted unfortunately. I’m completely disappointed with this company I can’t find a number to call this is just pitiful and awful of this brand not to have help