Sorry to hear about your problem. I will be happy to help but need more information to give you the correct answer (the more details you provide the faster we can solve your problem):
1. What is the full model number of the Tv?
2. Are you using the original Sony Tv remote?
3. Exactly which buttons work and which ones don't?
Please reply here to this topic.
So your question is "How to reach sony support to fix this ". You can call Sony at 1-239-768-7547 Mon-Fri 9:00am-8:00pm ET.